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Current hierarchy for propulsion and energy (5,880)
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propulsion and energy (5,880) propulsion and energy (5,880) exclude
  air motors and turbines (10) propulsion and energy (5,880) -> air motors and turbines (10)  
  animal powered apparatus (161) propulsion and energy (5,880) -> animal powered apparatus (161)  
  axial internal combustion engines (1) propulsion and energy (5,880) -> axial internal combustion engines (1)  
  clutches (10) propulsion and energy (5,880) -> clutches (10)  
  external combustion engines (84) propulsion and energy (5,880) -> external combustion engines (84) exclude
    hot air engines (80) propulsion and energy (5,880) -> external combustion engines (84) -> hot air engines (80)  
  gas calorimeters (1) propulsion and energy (5,880) -> gas calorimeters (1)  
  gas cleaning apparatus (5) propulsion and energy (5,880) -> gas cleaning apparatus (5)  
  gas generators (8) propulsion and energy (5,880) -> gas generators (8)  
  gas preheaters (2) propulsion and energy (5,880) -> gas preheaters (2)  
  gas turbines (3) propulsion and energy (5,880) -> gas turbines (3) exclude
    gas turbine lubricators (1) propulsion and energy (5,880) -> gas turbines (3) -> gas turbine lubricators (1)  
  gunpowder engines (1) propulsion and energy (5,880) -> gunpowder engines (1)  
  human powered apparatus (36) propulsion and energy (5,880) -> human powered apparatus (36)  
  internal combustion engines (2,034) propulsion and energy (5,880) -> internal combustion engines (2,034) exclude
    air supply apparatus (8) propulsion and energy (5,880) -> internal combustion engines (2,034) -> air supply apparatus (8)  
    carburetors (119) propulsion and energy (5,880) -> internal combustion engines (2,034) -> carburetors (119)  
    coal oil engines (1) propulsion and energy (5,880) -> internal combustion engines (2,034) -> coal oil engines (1)  
    cooling apparatus (34) propulsion and energy (5,880) -> internal combustion engines (2,034) -> cooling apparatus (34)  
    crankshafts (8) propulsion and energy (5,880) -> internal combustion engines (2,034) -> crankshafts (8)  
    cylinder heads (4) propulsion and energy (5,880) -> internal combustion engines (2,034) -> cylinder heads (4)  
    cylinders (9) propulsion and energy (5,880) -> internal combustion engines (2,034) -> cylinders (9)  
    diesel engines (41) propulsion and energy (5,880) -> internal combustion engines (2,034) -> diesel engines (41) exclude
      valve gear (11) propulsion and energy (5,880) -> internal combustion engines (2,034) -> diesel engines (41) -> valve gear (11)  
    engine bases (4) propulsion and energy (5,880) -> internal combustion engines (2,034) -> engine bases (4)  
    engine control apparatus (3) propulsion and energy (5,880) -> internal combustion engines (2,034) -> engine control apparatus (3)  
    engine thermostats (2) propulsion and energy (5,880) -> internal combustion engines (2,034) -> engine thermostats (2)  
    exhaust mechanisms (15) propulsion and energy (5,880) -> internal combustion engines (2,034) -> exhaust mechanisms (15)  
    fuel primers (7) propulsion and energy (5,880) -> internal combustion engines (2,034) -> fuel primers (7)  
    fuel pumps (33) propulsion and energy (5,880) -> internal combustion engines (2,034) -> fuel pumps (33)  
    fuel systems (36) propulsion and energy (5,880) -> internal combustion engines (2,034) -> fuel systems (36)  
    fuel tanks (1) propulsion and energy (5,880) -> internal combustion engines (2,034) -> fuel tanks (1)  
    gas and gasoline engines (775) propulsion and energy (5,880) -> internal combustion engines (2,034) -> gas and gasoline engines (775)  
    ignition systems (329) propulsion and energy (5,880) -> internal combustion engines (2,034) -> ignition systems (329) exclude
      magnetos (35) propulsion and energy (5,880) -> internal combustion engines (2,034) -> ignition systems (329) -> magnetos (35)  
      spark plugs (3) propulsion and energy (5,880) -> internal combustion engines (2,034) -> ignition systems (329) -> spark plugs (3)  
    internal combustion engine governors (102) propulsion and energy (5,880) -> internal combustion engines (2,034) -> internal combustion engine governors (102)  
    internal combustion engine indicators (19) propulsion and energy (5,880) -> internal combustion engines (2,034) -> internal combustion engine indicators (19)  
    internal combustion engine lubrication (36) propulsion and energy (5,880) -> internal combustion engines (2,034) -> internal combustion engine lubrication (36)  
    internal combustion engine valves (62) propulsion and energy (5,880) -> internal combustion engines (2,034) -> internal combustion engine valves (62)  
    internal combustion traction engines (24) propulsion and energy (5,880) -> internal combustion engines (2,034) -> internal combustion traction engines (24) exclude
      attachments (5) propulsion and energy (5,880) -> internal combustion engines (2,034) -> internal combustion traction engines (24) -> attachments (5)  
    kerosene engines (3) propulsion and energy (5,880) -> internal combustion engines (2,034) -> kerosene engines (3)  
    mufflers (7) propulsion and energy (5,880) -> internal combustion engines (2,034) -> mufflers (7)  
    oil engines (165) propulsion and energy (5,880) -> internal combustion engines (2,034) -> oil engines (165) exclude
      exhaust apparatus (1) propulsion and energy (5,880) -> internal combustion engines (2,034) -> oil engines (165) -> exhaust apparatus (1)  
      fuel injection apparatus (20) propulsion and energy (5,880) -> internal combustion engines (2,034) -> oil engines (165) -> fuel injection apparatus (20)  
      ignition apparatus (6) propulsion and energy (5,880) -> internal combustion engines (2,034) -> oil engines (165) -> ignition apparatus (6)  
      pistons (3) propulsion and energy (5,880) -> internal combustion engines (2,034) -> oil engines (165) -> pistons (3)  
      valves (9) propulsion and energy (5,880) -> internal combustion engines (2,034) -> oil engines (165) -> valves (9)  
      vaporizers (4) propulsion and energy (5,880) -> internal combustion engines (2,034) -> oil engines (165) -> vaporizers (4)  
    oil filters (1) propulsion and energy (5,880) -> internal combustion engines (2,034) -> oil filters (1)  
    opposed piston engines (11) propulsion and energy (5,880) -> internal combustion engines (2,034) -> opposed piston engines (11)  
    piston rings (1) propulsion and energy (5,880) -> internal combustion engines (2,034) -> piston rings (1)  
    pistons (6) propulsion and energy (5,880) -> internal combustion engines (2,034) -> pistons (6)  
    radial engines (3) propulsion and energy (5,880) -> internal combustion engines (2,034) -> radial engines (3)  
    reverse gear apparatus (3) propulsion and energy (5,880) -> internal combustion engines (2,034) -> reverse gear apparatus (3)  
    rotary engines (52) propulsion and energy (5,880) -> internal combustion engines (2,034) -> rotary engines (52)  
    starters (41) propulsion and energy (5,880) -> internal combustion engines (2,034) -> starters (41)  
    superchargers (2) propulsion and energy (5,880) -> internal combustion engines (2,034) -> superchargers (2)  
  nautical propulsion apparatus (133) propulsion and energy (5,880) -> nautical propulsion apparatus (133)  
  oil gas apparatus (6) propulsion and energy (5,880) -> oil gas apparatus (6)  
  oil hydraulic motors (4) propulsion and energy (5,880) -> oil hydraulic motors (4)  
  power plants (7) propulsion and energy (5,880) -> power plants (7)  
  power takeoff apparatus (1) propulsion and energy (5,880) -> power takeoff apparatus (1)  
  power transmission chains, belts and sprockets (2) propulsion and energy (5,880) -> power transmission chains, belts and sprockets (2)  
  power transmissions (6) propulsion and energy (5,880) -> power transmissions (6)  
  propulsion pumps (1) propulsion and energy (5,880) -> propulsion pumps (1)  
  steam apparatus (1,767) propulsion and energy (5,880) -> steam apparatus (1,767) exclude
    axial steam engines (1) propulsion and energy (5,880) -> steam apparatus (1,767) -> axial steam engines (1)  
    low water alarms (5) propulsion and energy (5,880) -> steam apparatus (1,767) -> low water alarms (5)  
    oscillating steam engines (23) propulsion and energy (5,880) -> steam apparatus (1,767) -> oscillating steam engines (23)  
    portable boilers (3) propulsion and energy (5,880) -> steam apparatus (1,767) -> portable boilers (3)  
    portable steam engines (30) propulsion and energy (5,880) -> steam apparatus (1,767) -> portable steam engines (30)  
    rotary steam engines (264) propulsion and energy (5,880) -> steam apparatus (1,767) -> rotary steam engines (264)  
    stationary boilers (440) propulsion and energy (5,880) -> steam apparatus (1,767) -> stationary boilers (440) exclude
      blow off valves (2) propulsion and energy (5,880) -> steam apparatus (1,767) -> stationary boilers (440) -> blow off valves (2)  
      boiler level gauges (2) propulsion and energy (5,880) -> steam apparatus (1,767) -> stationary boilers (440) -> boiler level gauges (2)  
      boiler washout apparatus (1) propulsion and energy (5,880) -> steam apparatus (1,767) -> stationary boilers (440) -> boiler washout apparatus (1)  
      feedwater apparatus (116) propulsion and energy (5,880) -> steam apparatus (1,767) -> stationary boilers (440) -> feedwater apparatus (116)  
      fuel burners (6) propulsion and energy (5,880) -> steam apparatus (1,767) -> stationary boilers (440) -> fuel burners (6)  
      solid fuel stokers (12) propulsion and energy (5,880) -> steam apparatus (1,767) -> stationary boilers (440) -> solid fuel stokers (12)  
      spark arresters (6) propulsion and energy (5,880) -> steam apparatus (1,767) -> stationary boilers (440) -> spark arresters (6)  
      steam and water separators (2) propulsion and energy (5,880) -> steam apparatus (1,767) -> stationary boilers (440) -> steam and water separators (2)  
      steam pressure gauges (36) propulsion and energy (5,880) -> steam apparatus (1,767) -> stationary boilers (440) -> steam pressure gauges (36)  
      steam pumps (17) propulsion and energy (5,880) -> steam apparatus (1,767) -> stationary boilers (440) -> steam pumps (17)  
      steam valves (12) propulsion and energy (5,880) -> steam apparatus (1,767) -> stationary boilers (440) -> steam valves (12)  
      vacuum pumps (3) propulsion and energy (5,880) -> steam apparatus (1,767) -> stationary boilers (440) -> vacuum pumps (3)  
    steam calorimeters (1) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam calorimeters (1)  
    steam carriages (19) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam carriages (19)  
    steam condensers (9) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam condensers (9)  
    steam engine indicators (67) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam engine indicators (67) exclude
      reducing wheels (5) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam engine indicators (67) -> reducing wheels (5)  
    steam fire engines (9) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam fire engines (9)  
    steam heating (28) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam heating (28)  
    steam hoists and winches (1) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam hoists and winches (1)  
    steam jacks (1) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam jacks (1)  
    steam meters (4) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam meters (4)  
    steam motors (4) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam motors (4)  
    steam plows (15) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam plows (15)  
    steam pumping engines (17) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam pumping engines (17)  
    steam pumps (36) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam pumps (36)  
    steam road engines (47) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam road engines (47)  
    steam road wagons (5) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam road wagons (5)  
    steam rollers (12) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam rollers (12)  
    steam safety valves (82) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam safety valves (82)  
    steam stills (43) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam stills (43)  
    steam superheaters (3) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam superheaters (3)  
    steam traction engines (522) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) exclude
      traction engine bearings (4) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine bearings (4)  
      traction engine boiler leveling apparatus (3) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine boiler leveling apparatus (3)  
      traction engine boilers (15) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine boilers (15)  
      traction engine brakes (4) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine brakes (4)  
      traction engine cabs and roofs (2) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine cabs and roofs (2)  
      traction engine clutches (3) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine clutches (3)  
      traction engine connecting rods (2) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine connecting rods (2)  
      traction engine governors (17) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine governors (17)  
      traction engine propulsion components (92) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine propulsion components (92)  
      traction engine spark arresters (8) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine spark arresters (8)  
      traction engine steering apparatus (53) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine steering apparatus (53)  
      traction engine superheaters (1) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine superheaters (1)  
      traction engine suspensions (28) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine suspensions (28)  
      traction engine tenders (6) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine tenders (6)  
      traction engine tracks (26) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine tracks (26)  
      traction engine valve gear (8) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine valve gear (8)  
      traction engine wheels (25) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam traction engines (522) -> traction engine wheels (25)  
    steam turbines (44) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam turbines (44)  
    steam valves (12) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam valves (12)  
    steam whistles (5) propulsion and energy (5,880) -> steam apparatus (1,767) -> steam whistles (5)  
    steamboats (40) propulsion and energy (5,880) -> steam apparatus (1,767) -> steamboats (40)  
    water injectors (69) propulsion and energy (5,880) -> steam apparatus (1,767) -> water injectors (69)  
  steam engines (1,075) propulsion and energy (5,880) -> steam engines (1,075) exclude
    reversing gear (2) propulsion and energy (5,880) -> steam engines (1,075) -> reversing gear (2)  
    steam blow offs (1) propulsion and energy (5,880) -> steam engines (1,075) -> steam blow offs (1)  
    steam check valves (5) propulsion and energy (5,880) -> steam engines (1,075) -> steam check valves (5)  
    steam cross heads (3) propulsion and energy (5,880) -> steam engines (1,075) -> steam cross heads (3)  
    steam dash pots (3) propulsion and energy (5,880) -> steam engines (1,075) -> steam dash pots (3)  
    steam engine beds (4) propulsion and energy (5,880) -> steam engines (1,075) -> steam engine beds (4)  
    steam engine brakes (1) propulsion and energy (5,880) -> steam engines (1,075) -> steam engine brakes (1)  
    steam engine crank rods (7) propulsion and energy (5,880) -> steam engines (1,075) -> steam engine crank rods (7)  
    steam engine cylinders (10) propulsion and energy (5,880) -> steam engines (1,075) -> steam engine cylinders (10)  
    steam engine governors (169) propulsion and energy (5,880) -> steam engines (1,075) -> steam engine governors (169)  
    steam engine lubricators (110) propulsion and energy (5,880) -> steam engines (1,075) -> steam engine lubricators (110)  
    steam engine packing (10) propulsion and energy (5,880) -> steam engines (1,075) -> steam engine packing (10)  
    steam engine pistons (28) propulsion and energy (5,880) -> steam engines (1,075) -> steam engine pistons (28) exclude
      piston ring and packing (20) propulsion and energy (5,880) -> steam engines (1,075) -> steam engine pistons (28) -> piston ring and packing (20)  
    steam engine power meters (2) propulsion and energy (5,880) -> steam engines (1,075) -> steam engine power meters (2)  
    steam engine stuffing boxes (2) propulsion and energy (5,880) -> steam engines (1,075) -> steam engine stuffing boxes (2)  
    steam engine valve gear (135) propulsion and energy (5,880) -> steam engines (1,075) -> steam engine valve gear (135)  
    steam engine valves (127) propulsion and energy (5,880) -> steam engines (1,075) -> steam engine valves (127)  
    steam spark arresters (3) propulsion and energy (5,880) -> steam engines (1,075) -> steam spark arresters (3)  
  water power (517) propulsion and energy (5,880) -> water power (517) exclude
    hydraulic motors (40) propulsion and energy (5,880) -> water power (517) -> hydraulic motors (40)  
    nozzles (5) propulsion and energy (5,880) -> water power (517) -> nozzles (5) exclude
      nozzle controllers (1) propulsion and energy (5,880) -> water power (517) -> nozzles (5) -> nozzle controllers (1)  
    relief valves (1) propulsion and energy (5,880) -> water power (517) -> relief valves (1)  
    tide mills (26) propulsion and energy (5,880) -> water power (517) -> tide mills (26)  
    unloader valves (1) propulsion and energy (5,880) -> water power (517) -> unloader valves (1)  
    water wheels (456) propulsion and energy (5,880) -> water power (517) -> water wheels (456) exclude
      turbine water wheels (130) propulsion and energy (5,880) -> water power (517) -> water wheels (456) -> turbine water wheels (130)  
      water wheel governors (17) propulsion and energy (5,880) -> water power (517) -> water wheels (456) -> water wheel governors (17)  
  wind power apparatus (76) propulsion and energy (5,880) -> wind power apparatus (76)  
 
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hardware (217) | household tools (120) | household (2,105) | industrial machines (1,828) | industrial tanks (5) | industrial tools (1,164) | knives and cutters (167) | layout tools (2,604)
manufacturing (304) | material handling (290) | metalworking machines (14,631) | metalworking tools (1,966) | musical instruments (30) | photographic apparatus (321) | pliers (722) | potters tools (3)
propulsion and energy (5,880) | punches (47) | rules (493) | screwdrivers (557) | specialty machines (2,308) | specialty tools (1,483) | stoneworking (133) | structures (110)
tool making (449) | trade specific (5,860) | transportation (970) | water distribution systems (222) | woodworking machines (15,436) | woodworking tools (4,134) | work holding (1,565) | wrenches (5,908)

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