| Patents Granted on 1931-04-07 |
Patents 1 -
15
of 18
      |
| Number | Date | Patentee | Title | Type |
| 1,799,215 | Apr. 07, 1931 | V.V. Colby | Cutting machine and support | handheld power jigsaws |
| 1,799,261 | Apr. 07, 1931 | W.F. Stoody | Belt drive and tightening device | industrial machine pulleys and belt drive mechanisms |
| 1,799,306 | Apr. 07, 1931 | J. Mainland | Combine | cotton harvesters |
| 1,799,358 | Apr. 07, 1931 | W.C. De Roo | Safety-catch mechanism | radial drill presses |
| 1,799,393 | Apr. 07, 1931 | A.E. Rylander | Variable-Speed Brace Drill | braces |
| 1,799,462 | Apr. 07, 1931 | W.L. Hawkins | Spare-tire lock | locks |
| 1,799,474 | Apr. 07, 1931 | J.S. McChesney | Vise | bench vises |
| 1,799,483 | Apr. 07, 1931 | W.A. Smith | Method of and machine for making one-piece mop heads | |
| 1,799,493 | Apr. 07, 1931 | J.B. Armitage | Over-Arm Clamp for Machine Tools | milling machines |
| 1,799,622 | Apr. 07, 1931 | W.S. Stuart | Nut and Pipe Wrench | pipe and nut combination wrenches |
| 1,799,739 | Apr. 07, 1931 | J.B. Elfring, C.G. Schiele | Precision measuring device | measuring tools |
| 1,799,840 | Apr. 07, 1931 | E.F. Beugler | Barrel-making machine | cooper |
| 1,799,841 | Apr. 07, 1931 | E.F. Beugler | Barrel chamfering, crozing, and trimming apparatus | cooper |
| 1,799,842 | Apr. 07, 1931 | E.F. Beugler | Barrel-making machine | cooper |
| 1,799,866 | Apr. 07, 1931 | C.H. Roth | Photographic Studio Set | photographic studio apparatus |
