| Patents for none listed |
Patents 541 -
555
of 3199
      |
| Number | Date | Patentee | Title | Type |
| 1,361,219 | Dec. 07, 1920 | J.J. Bartenstein | Valve Spring Holder | valve spring tools |
| 1,361,406 | Dec. 07, 1920 | J.V. Romig | Combined Micrometer Caliper | micrometers |
| 1,361,686 | Dec. 07, 1920 | M.C. Conwell | Tool | boring heads |
| 1,361,848 | Dec. 14, 1920 | J.A. Green | Surface Gage | measurement gauges |
| 1,361,923 | Dec. 14, 1920 | W.M. Stovall | Wrench | self-adjust wrenches |
| D56,812 | Dec. 28, 1920 | A. Harris | Screwdriver | screwdrivers |
| 1,363,343 | Dec. 28, 1920 | H.G. Norwood | Wrench | alligator wrenches |
| 1,363,587 | Dec. 28, 1920 | B.M. Hanson | Metal Working Machine | metal slotting machines |
| 1,364,937 | Jan. 11, 1921 | O.R. Kirkpatrick | Monkey Wrench | quick adjust wrenches |
| 1,365,468 | Jan. 11, 1921 | J.F. Duby | Valve Spring Lifter | valve spring tools |
| 1,365,484 | Jan. 11, 1921 | I. Greenwald | Micrometer | micrometers |
| D56,945 | Jan. 18, 1921 | P. Piotrowski | Wrench | wrenches |
| D56,979 | Jan. 25, 1921 | N. Larson | Combination Tool | combination tools |
| 1,366,413 | Jan. 25, 1921 | F.C. Olin | Tractor | tractors |
| 1,367,969 | Feb. 08, 1921 | J.C. Holley | Wrench | brace wrenches |
