| Patents Granted on 1931-07-28 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 1,815,980 | Jul. 28, 1931 | M.C. Dellinger, H.W. Kulp | Valve Spring Lifter | valve spring tools |
| 1,816,117 | Jul. 28, 1931 | G.P. Kline | Rim Machine and Method of Forming Rims | tire rim making machines |
| 1,816,170 | Jul. 28, 1931 | C. Booth | Grinding Machinery | grinding machines |
| 1,816,171 | Jul. 28, 1931 | C. Booth | Valve Grinder | grinding machines |
| 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 |
| 1,816,792 | Jul. 28, 1931 | S.O. Paull | Hand oiler | oil cans |
