| Patents Granted on 1931-07-?? |
Patents 1 -
15
of 56
      |
| Number | Date | Patentee | Title | Type |
| 1,812,871 | Jul. 07, 1931 | B.P. Graves | Variable Speed Controller Mechanism | machine tool controls |
| 1,813,002 | Jul. 07, 1931 | J.J. Van Hamersveld | Indicator | metal lathe accessories and attachments |
| 1,813,231 | Jul. 07, 1931 | J.M. Crowe | Motor driven hand tool | handheld circular saws |
| 1,813,355 | Jul. 07, 1931 | H.M. Lucas | Metal Working Machine | metalworking machine mechanisms |
| 1,813,415 | Jul. 07, 1931 | J.G. McClean | Riveting machine | riveting machines |
| 1,813,568 | Jul. 07, 1931 | R.E. De Walt | Adjustable machine head | radial arm saws |
| 1,813,682 | Jul. 07, 1931 | E.A. Shriver | Wheel Dresser | grinding machines |
| 1,813,810 | Jul. 07, 1931 | C.D. McDonald, B.A. Deisch | Can end | can making machines |
| 1,813,954 | Jul. 14, 1931 | H.G. Rice | Bottle Capper | bottle cappers |
| 1,814,014 | Jul. 14, 1931 | S. Vitali | Gripping Tool For Jars | jar wrenches |
| 1,814,092 | Jul. 14, 1931 | J.W. Motherwell | Pressure gauge | vacuum and pressure gauges |
| 1,814,151 | Jul. 14, 1931 | S.N. Gundlach | Shingle Cutter | splitting and shearing machinery |
| 1,814,209 | Jul. 14, 1931 | S. Einstein | Centerless Grinding Machine | grinding machines |
| 1,814,211 | Jul. 14, 1931 | J. Garbarek | Tool Holder | lathe tool holders and tool posts |
| 1,814,267 | Jul. 14, 1931 | C.H. Swartz | Cylinder sleeve and method of producing the same | |
