| Patents for none listed |
Patents 511 -
525
of 3142
      |
| Number | Date | Patentee | Title | Type |
| 1,341,546 | May 25, 1920 | J.J. Davis | Micrometer | micrometers |
| 1,341,934 | Jun. 01, 1920 | G.C. Schoenborn | Tool Holder | drilling and boring tool holders |
| GB-144,091 | Jun. 10, 1920 | O. Olson, G.R. Fullenwider | Improvements in Angular Socket Wrenches and Screwdrivers | wrench handle components |
| 1,343,257 | Jun. 15, 1920 | J.C. Fletcher | Tool Holder | lathe tool holders and tool posts |
| 1,343,751 | Jun. 15, 1920 | F.L. Simmons | Adjustable V-Block and the Like for Magnetic Chucks | V blocks |
| 1,346,304 | Jul. 13, 1920 | A.F. Donaldson | Micrometer | micrometers |
| 1,346,306 | Jul. 13, 1920 | H.T. Duket | Pliers | pliers |
| 1,346,416 | Jul. 13, 1920 | C.H. Newton | Valve Spring Compressor | valve spring tools |
| GB-147,355 | Jul. 22, 1920 | W.L. Bessolo | Improvements in PIpe Wrenches | chain and strap wrenches |
| 1,349,630 | Aug. 17, 1920 | C.H. Sheasley | Starting Port for Valveless Two-Cycle Internal Combustion Engines | |
| 1,351,276 | Aug. 31, 1920 | A.H. Benwell | Wrench | pipe wrenches |
| 1,351,528 | Aug. 31, 1920 | A.W. Martin | Gage | height gages |
| 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 |
