| Patents for none listed |
Patents 541 -
555
of 3326
      |
| Number | Date | Patentee | Title | Type |
| 1,351,663 | Aug. 31, 1920 | J.R. Koch | Gage | special purpose gauges |
| 1,353,246 | Sep. 21, 1920 | A.W. Kiefer | Pipe Wrench | pipe wrenches |
| 1,353,608 | Sep. 21, 1920 | R.H. Parker | Scew Thread Gage | measurement gauges |
| 1,355,620 | Oct. 12, 1920 | F.B. Rogers | Cane Mill | sugar cane apparatus |
| 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 |
