| Patents for none listed |
Patents 1216 -
1230
of 3327
      |
| Number | Date | Patentee | Title | Type |
| 1,794,361 | Mar. 03, 1931 | L.F. Nenninger, B.P. Graves, E.J. Kearney, J.B. Armitage | Milling-Machine Spindle and Tool | milling machine tools |
| 1,794,441 | Mar. 03, 1931 | E.P. Bullard, Jr. | Vertical Turret Lathe | vertical turret lathes |
| 1,794,472 | Mar. 03, 1931 | F.H. Mussler | Hydraulic Change-Speed-Gear Mechanism | metalworking speed changing mechanisms |
| 1,797,121 | Mar. 17, 1931 | F.J. Bohn | Micrometer Gage for Internal Threads | micrometers |
| 1,797,122 | Mar. 17, 1931 | F.J. Bohn | Micrometer Gauge for Internal Threads | thread gages |
| GB-345,092 | Mar. 19, 1931 | n. listed | Improvements in or Relating to Grinding or Abrading Machines | grinding machines |
| 1,797,730 | Mar. 24, 1931 | E.M. Pfauser | Socket Attachment for Tools | socket wrenches |
| 1,798,194 | Mar. 31, 1931 | J.H. Dodge | Reversible Ratchet Wrench | ratchet wrenches |
| 1,798,481 | Mar. 31, 1931 | N.F. McNaught, E.H. Peterson | Ratchet lever | ratchet wrenches |
| 1,798,482 | Mar. 31, 1931 | N.F. McNaught, E.H. Peterson | Ratchet lever | |
| 1,798,496 | Mar. 31, 1931 | J. Reid | Lubricating Eccentric Driving Gears | internal combustion engine lubrication |
| 1,799,622 | Apr. 07, 1931 | W.S. Stuart | Nut and Pipe Wrench | pipe and nut combination wrenches |
| 1,800,447 | Apr. 14, 1931 | O.P. Froeschl | Pliers | pliers |
| 1,800,982 | Apr. 14, 1931 | E.C. Bullard, F.H. Mussler | Hydraulic Change-Speed Gear Mechanism | metalworking speed changing mechanisms |
| 1,804,061 | May 05, 1931 | C.H. Roth | Camera | cameras |
