| Patents for none listed |
Patents 511 -
525
of 3291
      |
| Number | Date | Patentee | Title | Type |
| 1,330,969 | Feb. 17, 1920 | E.J. Woolf | Carbureting System For Internal-Combustion Engines | carburetors |
| 1,331,351 | Feb. 17, 1920 | M.L. Minor | Nutcracker | nutcrackers |
| D54,516 | Feb. 24, 1920 | J.E. Durham, Jr. | Pair of Pliers | pliers |
| 1,332,984 | Mar. 09, 1920 | R.D. Hill | Pipe Tongs | pipe tongs |
| 1,333,453 | Mar. 09, 1920 | P. Pariso, J. Sardo | Micrometer | micrometers |
| 1,334,156 | Mar. 16, 1920 | O. Becklin, J.H. Lagreid | Wrench | quick adjust wrenches |
| 1,334,535 | Mar. 23, 1920 | C.L. Hawes | Self Lubricating Bearing | metalworking machine bearings |
| 1,334,674 | Mar. 23, 1920 | A. Panitti, Jr. | Right angle Ratchet Screwdriver | ratcheting screwdrivers |
| 1,335,408 | Mar. 30, 1920 | W.I. Tuttle | Brace Construction | brace handles |
| 1,335,409 | Mar. 30, 1920 | W.I. Tuttle | Construction For Braces | brace wrenches |
| GB-140,722 | Apr. 01, 1920 | A.H. Lloyd, A. Herbert | Improvements in Built-up Cutters for Use in Milling Machines or Other Machine Tools | milling machine tools |
| 1,336,126 | Apr. 06, 1920 | G.A. Carlson | Can Opener | can and jar openers |
| 1,337,387 | Apr. 20, 1920 | C. Bouillon | Tool Cabinet | metal lathe accessories and attachments |
| 1,338,385 | Apr. 27, 1920 | E. McCoy | Air-Brake-Pump Lubricator | steam engine lubricators |
| GB-142,008 | Apr. 29, 1920 | E. Edelmann | Improved Combination Tool | combination tools |
