| Patents for none listed |
Patents 1231 -
1245
of 3298
      |
| Number | Date | Patentee | Title | Type |
| 1,815,980 | Jul. 28, 1931 | M.C. Dellinger, H.W. Kulp | Valve Spring Lifter | valve spring tools |
| 1,816,548 | Jul. 28, 1931 | L. Robidoux | Simplified Rule (Fractional markings to 64's) | scales |
| 1,816,598 | Jul. 28, 1931 | A.L. Martin | Merchandise Display Box | wrench set holders |
| 1,817,390 | Aug. 04, 1931 | A.J. Meyer | Internal Combustion Engine | internal combustion engine valves |
| 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 |
