| Patents for none listed |
Patents 526 -
540
of 3142
      |
| Number | Date | Patentee | Title | Type |
| 1,357,323 | Nov. 02, 1920 | F.O. Jaques, Jr. | Measuring Instrument | measurement gauges |
| 1,357,813 | Nov. 02, 1920 | C.G. Olson | Testing Machine | measurement gauges |
| 1,358,074 | Nov. 09, 1920 | W.H. Gates | Die Head | tap and die holders |
| 1,359,325 | Nov. 16, 1920 | W.A. Butler | Ratchet Wrench | ratchet wrenches |
| 1,360,016 | Nov. 23, 1920 | G.G. Porter | Boring and cutting tool | lathe tools |
| 1,360,368 | Nov. 30, 1920 | G.N. Coburn | Screw holding screwdriver | screwdriver blades |
| 1,361,130 | Dec. 07, 1920 | P. York | Wrench | wrench handle components |
| 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 |
