| Patents for Oscar D. Hapgood |
Patents 1 -
8
of 8
      |
| Number | Date | Patentee | Title | Type |
| 1,102,581 | Jul. 07, 1914 | O.D. Hapgood | Valve Grinder | valve grinding tools |
| 1,157,218 | Oct. 19, 1915 | O.D. Hapgood | Breast-drill | breast drills |
| 1,166,364 | Dec. 28, 1915 | O.D. Hapgood | Tool | push drills |
| 1,172,793 | Feb. 22, 1916 | O.D. Hapgood | Revolution Counter | measurement gauges |
| 1,449,400 | Mar. 27, 1923 | O.D. Hapgood | Hand tool | screwdrivers |
| 1,462,963 | Jul. 24, 1923 | O.D. Hapgood | Tool | breast drills |
| 1,518,579 | Dec. 09, 1924 | O.D. Hapgood | Valve-grinding tool | |
| 1,624,339 | Apr. 12, 1927 | O.D. Hapgood | Level | levels |
