| Patents Granted on 1931-07-07 |
Patents 1 -
8
of 8
      |
| 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 |
