| Patents for none listed |
Patents 1231 -
1245
of 3291
      |
| Number | Date | Patentee | Title | Type |
| GB-354,386 | Aug. 10, 1931 | H. Shipley, G. Adcock | Multiple Spindle Drilling And Like Machines | multiple spindle drill presses |
| GB-354,729 | Aug. 12, 1931 | n. listed | Improvements in or Relating to Centerless Grinding Machines | grinding machines |
| 1,819,689 | Aug. 18, 1931 | P.O. Ott | Hydraulic Pump | hydraulic pumps |
| GB-356,242 | Sep. 02, 1931 | n. listed | Improvements in or Relating to Centerless Grinding Machines | grinding machines |
| 1,822,070 | Sep. 08, 1931 | C. Vallone | Holder for Tools or Implements | tool holders |
| 1,822,413 | Sep. 08, 1931 | W.E. Favini, A.D. Mizzy | Micrometer | micrometers |
| 1,822,428 | Sep. 08, 1931 | J. Zilliox | Wrench | nut wrenches |
| 1,823,494 | Sep. 15, 1931 | H.C. Jacobs | Combined Plier and Wrench | pliers |
| GB-357,188 | Sep. 18, 1931 | n. listed | Improvements in or Relating to Centreless Grinding Machines | grinding machines |
| GB-357,621 | Sep. 18, 1931 | n. listed | Improvements in Internal Centerless Grinding Machines | grinding machines |
| GB-357,622 | Sep. 18, 1931 | n. listed | Improvements in or Relating to Grinding or Abrading Machines | grinding machines |
| 1,824,944 | Sep. 29, 1931 | F.J. Carnelli | Chain Wrench | chain and strap wrenches |
| 1,826,739 | Oct. 13, 1931 | W.F. Costello | Tool Set and Container Therefor | wrench set holders |
| 1,827,202 | Oct. 13, 1931 | W.F. Klein | Ratchet Wrench | ratchet wrenches |
| 1,828,173 | Oct. 20, 1931 | F.J. Carnelli | Chain Pipe Wrench | chain and strap wrenches |
