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Current hierarchy for propulsion and energy (6,031)
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propulsion and energy (6,031) propulsion and energy (6,031) exclude
  air motors and turbines (11) propulsion and energy (6,031) -> air motors and turbines (11)  
  animal powered apparatus (162) propulsion and energy (6,031) -> animal powered apparatus (162)  
  axial internal combustion engines (1) propulsion and energy (6,031) -> axial internal combustion engines (1)  
  clutches (10) propulsion and energy (6,031) -> clutches (10)  
  external combustion engines (85) propulsion and energy (6,031) -> external combustion engines (85) exclude
    hot air engines (81) propulsion and energy (6,031) -> external combustion engines (85) -> hot air engines (81)  
  gas calorimeters (1) propulsion and energy (6,031) -> gas calorimeters (1)  
  gas cleaning apparatus (5) propulsion and energy (6,031) -> gas cleaning apparatus (5)  
  gas generators (8) propulsion and energy (6,031) -> gas generators (8)  
  gas preheaters (2) propulsion and energy (6,031) -> gas preheaters (2)  
  gas turbines (4) propulsion and energy (6,031) -> gas turbines (4) exclude
    gas turbine lubricators (1) propulsion and energy (6,031) -> gas turbines (4) -> gas turbine lubricators (1)  
  gunpowder engines (1) propulsion and energy (6,031) -> gunpowder engines (1)  
  human powered apparatus (36) propulsion and energy (6,031) -> human powered apparatus (36)  
  internal combustion engines (2,043) propulsion and energy (6,031) -> internal combustion engines (2,043) exclude
    air supply apparatus (8) propulsion and energy (6,031) -> internal combustion engines (2,043) -> air supply apparatus (8)  
    carburetors (119) propulsion and energy (6,031) -> internal combustion engines (2,043) -> carburetors (119)  
    coal oil engines (1) propulsion and energy (6,031) -> internal combustion engines (2,043) -> coal oil engines (1)  
    cooling apparatus (35) propulsion and energy (6,031) -> internal combustion engines (2,043) -> cooling apparatus (35)  
    crankshafts (8) propulsion and energy (6,031) -> internal combustion engines (2,043) -> crankshafts (8)  
    cylinder heads (4) propulsion and energy (6,031) -> internal combustion engines (2,043) -> cylinder heads (4)  
    cylinders (9) propulsion and energy (6,031) -> internal combustion engines (2,043) -> cylinders (9)  
    diesel engines (42) propulsion and energy (6,031) -> internal combustion engines (2,043) -> diesel engines (42) exclude
      valve gear (11) propulsion and energy (6,031) -> internal combustion engines (2,043) -> diesel engines (42) -> valve gear (11)  
    engine bases (4) propulsion and energy (6,031) -> internal combustion engines (2,043) -> engine bases (4)  
    engine control apparatus (3) propulsion and energy (6,031) -> internal combustion engines (2,043) -> engine control apparatus (3)  
    engine thermostats (2) propulsion and energy (6,031) -> internal combustion engines (2,043) -> engine thermostats (2)  
    exhaust mechanisms (15) propulsion and energy (6,031) -> internal combustion engines (2,043) -> exhaust mechanisms (15)  
    fuel primers (7) propulsion and energy (6,031) -> internal combustion engines (2,043) -> fuel primers (7)  
    fuel pumps (33) propulsion and energy (6,031) -> internal combustion engines (2,043) -> fuel pumps (33)  
    fuel systems (36) propulsion and energy (6,031) -> internal combustion engines (2,043) -> fuel systems (36)  
    fuel tanks (1) propulsion and energy (6,031) -> internal combustion engines (2,043) -> fuel tanks (1)  
    gas and gasoline engines (776) propulsion and energy (6,031) -> internal combustion engines (2,043) -> gas and gasoline engines (776)  
    ignition systems (331) propulsion and energy (6,031) -> internal combustion engines (2,043) -> ignition systems (331) exclude
      magnetos (36) propulsion and energy (6,031) -> internal combustion engines (2,043) -> ignition systems (331) -> magnetos (36)  
      spark plugs (4) propulsion and energy (6,031) -> internal combustion engines (2,043) -> ignition systems (331) -> spark plugs (4)  
    internal combustion engine governors (102) propulsion and energy (6,031) -> internal combustion engines (2,043) -> internal combustion engine governors (102)  
    internal combustion engine indicators (19) propulsion and energy (6,031) -> internal combustion engines (2,043) -> internal combustion engine indicators (19)  
    internal combustion engine lubrication (36) propulsion and energy (6,031) -> internal combustion engines (2,043) -> internal combustion engine lubrication (36)  
    internal combustion engine valves (63) propulsion and energy (6,031) -> internal combustion engines (2,043) -> internal combustion engine valves (63)  
    internal combustion traction engines (24) propulsion and energy (6,031) -> internal combustion engines (2,043) -> internal combustion traction engines (24) exclude
      attachments (5) propulsion and energy (6,031) -> internal combustion engines (2,043) -> internal combustion traction engines (24) -> attachments (5)  
    kerosene engines (3) propulsion and energy (6,031) -> internal combustion engines (2,043) -> kerosene engines (3)  
    mufflers (7) propulsion and energy (6,031) -> internal combustion engines (2,043) -> mufflers (7)  
    oil engines (165) propulsion and energy (6,031) -> internal combustion engines (2,043) -> oil engines (165) exclude
      exhaust apparatus (1) propulsion and energy (6,031) -> internal combustion engines (2,043) -> oil engines (165) -> exhaust apparatus (1)  
      fuel injection apparatus (20) propulsion and energy (6,031) -> internal combustion engines (2,043) -> oil engines (165) -> fuel injection apparatus (20)  
      ignition apparatus (6) propulsion and energy (6,031) -> internal combustion engines (2,043) -> oil engines (165) -> ignition apparatus (6)  
      pistons (3) propulsion and energy (6,031) -> internal combustion engines (2,043) -> oil engines (165) -> pistons (3)  
      valves (9) propulsion and energy (6,031) -> internal combustion engines (2,043) -> oil engines (165) -> valves (9)  
      vaporizers (4) propulsion and energy (6,031) -> internal combustion engines (2,043) -> oil engines (165) -> vaporizers (4)  
    oil filters (1) propulsion and energy (6,031) -> internal combustion engines (2,043) -> oil filters (1)  
    opposed piston engines (11) propulsion and energy (6,031) -> internal combustion engines (2,043) -> opposed piston engines (11)  
    piston rings (1) propulsion and energy (6,031) -> internal combustion engines (2,043) -> piston rings (1)  
    pistons (7) propulsion and energy (6,031) -> internal combustion engines (2,043) -> pistons (7)  
    radial engines (3) propulsion and energy (6,031) -> internal combustion engines (2,043) -> radial engines (3)  
    reverse gear apparatus (3) propulsion and energy (6,031) -> internal combustion engines (2,043) -> reverse gear apparatus (3)  
    rotary engines (52) propulsion and energy (6,031) -> internal combustion engines (2,043) -> rotary engines (52)  
    starters (41) propulsion and energy (6,031) -> internal combustion engines (2,043) -> starters (41)  
    superchargers (3) propulsion and energy (6,031) -> internal combustion engines (2,043) -> superchargers (3)  
  nautical propulsion apparatus (133) propulsion and energy (6,031) -> nautical propulsion apparatus (133)  
  oil gas apparatus (6) propulsion and energy (6,031) -> oil gas apparatus (6)  
  oil hydraulic motors (4) propulsion and energy (6,031) -> oil hydraulic motors (4)  
  power plants (7) propulsion and energy (6,031) -> power plants (7)  
  power takeoff apparatus (1) propulsion and energy (6,031) -> power takeoff apparatus (1)  
  power transmission chains, belts and sprockets (2) propulsion and energy (6,031) -> power transmission chains, belts and sprockets (2)  
  power transmissions (6) propulsion and energy (6,031) -> power transmissions (6)  
  propulsion pumps (1) propulsion and energy (6,031) -> propulsion pumps (1)  
  steam apparatus (1,833) propulsion and energy (6,031) -> steam apparatus (1,833) exclude
    axial steam engines (1) propulsion and energy (6,031) -> steam apparatus (1,833) -> axial steam engines (1)  
    low water alarms (5) propulsion and energy (6,031) -> steam apparatus (1,833) -> low water alarms (5)  
    oscillating steam engines (26) propulsion and energy (6,031) -> steam apparatus (1,833) -> oscillating steam engines (26)  
    portable boilers (3) propulsion and energy (6,031) -> steam apparatus (1,833) -> portable boilers (3)  
    portable steam engines (30) propulsion and energy (6,031) -> steam apparatus (1,833) -> portable steam engines (30)  
    rotary steam engines (269) propulsion and energy (6,031) -> steam apparatus (1,833) -> rotary steam engines (269)  
    stationary boilers (453) propulsion and energy (6,031) -> steam apparatus (1,833) -> stationary boilers (453) exclude
      blow off valves (2) propulsion and energy (6,031) -> steam apparatus (1,833) -> stationary boilers (453) -> blow off valves (2)  
      boiler level gauges (2) propulsion and energy (6,031) -> steam apparatus (1,833) -> stationary boilers (453) -> boiler level gauges (2)  
      boiler washout apparatus (1) propulsion and energy (6,031) -> steam apparatus (1,833) -> stationary boilers (453) -> boiler washout apparatus (1)  
      feedwater apparatus (116) propulsion and energy (6,031) -> steam apparatus (1,833) -> stationary boilers (453) -> feedwater apparatus (116)  
      fuel burners (8) propulsion and energy (6,031) -> steam apparatus (1,833) -> stationary boilers (453) -> fuel burners (8)  
      solid fuel stokers (13) propulsion and energy (6,031) -> steam apparatus (1,833) -> stationary boilers (453) -> solid fuel stokers (13)  
      spark arresters (6) propulsion and energy (6,031) -> steam apparatus (1,833) -> stationary boilers (453) -> spark arresters (6)  
      steam and water separators (2) propulsion and energy (6,031) -> steam apparatus (1,833) -> stationary boilers (453) -> steam and water separators (2)  
      steam pressure gauges (36) propulsion and energy (6,031) -> steam apparatus (1,833) -> stationary boilers (453) -> steam pressure gauges (36)  
      steam pumps (17) propulsion and energy (6,031) -> steam apparatus (1,833) -> stationary boilers (453) -> steam pumps (17)  
      steam valves (12) propulsion and energy (6,031) -> steam apparatus (1,833) -> stationary boilers (453) -> steam valves (12)  
      vacuum pumps (3) propulsion and energy (6,031) -> steam apparatus (1,833) -> stationary boilers (453) -> vacuum pumps (3)  
    steam calorimeters (1) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam calorimeters (1)  
    steam carriages (21) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam carriages (21)  
    steam condensers (9) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam condensers (9)  
    steam engine indicators (70) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam engine indicators (70) exclude
      reducing wheels (5) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam engine indicators (70) -> reducing wheels (5)  
    steam fire engines (10) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam fire engines (10)  
    steam heating (28) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam heating (28)  
    steam hoists and winches (1) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam hoists and winches (1)  
    steam jacks (1) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam jacks (1)  
    steam meters (4) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam meters (4)  
    steam motors (4) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam motors (4)  
    steam plows (16) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam plows (16)  
    steam pumping engines (17) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam pumping engines (17)  
    steam pumps (36) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam pumps (36)  
    steam road engines (47) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam road engines (47)  
    steam road wagons (5) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam road wagons (5)  
    steam rollers (15) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam rollers (15)  
    steam safety valves (82) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam safety valves (82)  
    steam stills (43) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam stills (43)  
    steam superheaters (3) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam superheaters (3)  
    steam traction engines (556) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) exclude
      traction engine accessories (6) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine accessories (6)  
      traction engine bearings (4) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine bearings (4)  
      traction engine boiler leveling apparatus (3) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine boiler leveling apparatus (3)  
      traction engine boilers (16) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine boilers (16)  
      traction engine brakes (4) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine brakes (4)  
      traction engine cabs and roofs (2) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine cabs and roofs (2)  
      traction engine clutches (3) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine clutches (3)  
      traction engine connecting rods (2) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine connecting rods (2)  
      traction engine couplings (1) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine couplings (1)  
      traction engine governors (22) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine governors (22)  
      traction engine propulsion components (93) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine propulsion components (93)  
      traction engine spark arresters (8) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine spark arresters (8)  
      traction engine steering apparatus (55) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine steering apparatus (55)  
      traction engine superheaters (1) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine superheaters (1)  
      traction engine suspensions (28) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine suspensions (28)  
      traction engine tenders (6) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine tenders (6)  
      traction engine tracks (26) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine tracks (26)  
      traction engine valve gear (12) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine valve gear (12)  
      traction engine wheels (31) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam traction engines (556) -> traction engine wheels (31)  
    steam turbines (45) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam turbines (45)  
    steam valves (12) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam valves (12)  
    steam whistles (6) propulsion and energy (6,031) -> steam apparatus (1,833) -> steam whistles (6)  
    steamboats (40) propulsion and energy (6,031) -> steam apparatus (1,833) -> steamboats (40)  
    water injectors (69) propulsion and energy (6,031) -> steam apparatus (1,833) -> water injectors (69)  
  steam engines (1,155) propulsion and energy (6,031) -> steam engines (1,155) exclude
    reversing gear (2) propulsion and energy (6,031) -> steam engines (1,155) -> reversing gear (2)  
    steam blow offs (1) propulsion and energy (6,031) -> steam engines (1,155) -> steam blow offs (1)  
    steam check valves (5) propulsion and energy (6,031) -> steam engines (1,155) -> steam check valves (5)  
    steam cross heads (3) propulsion and energy (6,031) -> steam engines (1,155) -> steam cross heads (3)  
    steam dash pots (3) propulsion and energy (6,031) -> steam engines (1,155) -> steam dash pots (3)  
    steam engine beds (4) propulsion and energy (6,031) -> steam engines (1,155) -> steam engine beds (4)  
    steam engine brakes (1) propulsion and energy (6,031) -> steam engines (1,155) -> steam engine brakes (1)  
    steam engine crank rods (9) propulsion and energy (6,031) -> steam engines (1,155) -> steam engine crank rods (9)  
    steam engine cylinders (10) propulsion and energy (6,031) -> steam engines (1,155) -> steam engine cylinders (10)  
    steam engine governors (189) propulsion and energy (6,031) -> steam engines (1,155) -> steam engine governors (189)  
    steam engine lubricators (116) propulsion and energy (6,031) -> steam engines (1,155) -> steam engine lubricators (116)  
    steam engine packing (10) propulsion and energy (6,031) -> steam engines (1,155) -> steam engine packing (10)  
    steam engine pistons (28) propulsion and energy (6,031) -> steam engines (1,155) -> steam engine pistons (28) exclude
      piston ring and packing (20) propulsion and energy (6,031) -> steam engines (1,155) -> steam engine pistons (28) -> piston ring and packing (20)  
    steam engine power meters (2) propulsion and energy (6,031) -> steam engines (1,155) -> steam engine power meters (2)  
    steam engine stuffing boxes (2) propulsion and energy (6,031) -> steam engines (1,155) -> steam engine stuffing boxes (2)  
    steam engine valve gear (159) propulsion and energy (6,031) -> steam engines (1,155) -> steam engine valve gear (159)  
    steam engine valves (143) propulsion and energy (6,031) -> steam engines (1,155) -> steam engine valves (143)  
    steam spark arresters (3) propulsion and energy (6,031) -> steam engines (1,155) -> steam spark arresters (3)  
  water power (519) propulsion and energy (6,031) -> water power (519) exclude
    hydraulic motors (40) propulsion and energy (6,031) -> water power (519) -> hydraulic motors (40)  
    nozzles (5) propulsion and energy (6,031) -> water power (519) -> nozzles (5) exclude
      nozzle controllers (1) propulsion and energy (6,031) -> water power (519) -> nozzles (5) -> nozzle controllers (1)  
    relief valves (1) propulsion and energy (6,031) -> water power (519) -> relief valves (1)  
    tide mills (26) propulsion and energy (6,031) -> water power (519) -> tide mills (26)  
    unloader valves (1) propulsion and energy (6,031) -> water power (519) -> unloader valves (1)  
    water wheels (458) propulsion and energy (6,031) -> water power (519) -> water wheels (458) exclude
      turbine water wheels (132) propulsion and energy (6,031) -> water power (519) -> water wheels (458) -> turbine water wheels (132)  
      water wheel governors (17) propulsion and energy (6,031) -> water power (519) -> water wheels (458) -> water wheel governors (17)  
  wind power apparatus (76) propulsion and energy (6,031) -> wind power apparatus (76)  
 
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propulsion and energy (6,031) | punches (49) | rules (495) | screwdrivers (565) | specialty machines (2,473) | specialty tools (1,535) | stoneworking (135) | structures (114)
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