| Patents for none listed |
Patents 1171 -
1185
of 3298
      |
| Number | Date | Patentee | Title | Type |
| 1,778,949 | Oct. 21, 1930 | H.W. Johnson | Metal Working Tool | |
| GB-317,473 | Oct. 22, 1930 | n. listed | Improvements in or Relating to Grinding or Abrading Machines | grinding machines |
| DE-510,995 | Oct. 25, 1930 | n. listed | Centerless Grinding Machine for Grinding, Special Feature of Concentric Workpiece Surfaces | centerless grinders |
| DE-511,860 | Nov. 01, 1930 | n. listed | Process and Machine for Centerless Grinding of Workpieces With Several Different Diameters | centerless grinders |
| GB-337,451 | Nov. 03, 1930 | n. listed | Improvements in or Relating to Centerless Grinding Machines | grinding machines |
| FR-692,564 | Nov. 07, 1930 | n. listed | Improvements to Grinding Machines | grinding machines |
| DE-513,081 | Nov. 22, 1930 | n. listed | Machine for Centerless Grinding of Ring Surfaces on the Heads of Cylindrical Workpieces Provided With a Head | centerless grinders |
| 1,782,981 | Nov. 25, 1930 | J.A. Anderson | Improvement in Screwdriver blades | screwdriver blades |
| DE-513,722 | Dec. 04, 1930 | n. listed | Cylindrical Grinding Machine With Swiveling Workpiece Holder in and Out of Grinding Position | cylindrical grinders |
| 1,784,203 | Dec. 09, 1930 | H.G. Rice | Holder For Socket Wrench Sets | wrench set holders |
| DE-514,333 | Dec. 11, 1930 | n. listed | Feeding of the Workpieces, in Particular Balls, to Machines for Centerless Grinding | centerless grinders |
| 1,785,925 | Dec. 23, 1930 | J.C. Baker | Wrench | quick adjust wrenches |
| 1,787,787 | Jan. 06, 1931 | W.C. Kress | Pipe Vise | pipe and chain vises |
| 1,788,535 | Jan. 13, 1931 | N.F. McNaught, E.H. Peterson | Socket-wrench kit | wrench set holders |
| 1,790,238 | Jan. 27, 1931 | W.F. Klein | Socket Connection | socket wrenches |
