| Patents for H. E. Hart |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 591,528 | Oct. 12, 1897 | J.B. Ford | Wrench | bicycle or pocket wrenches |
| 684,488 | Oct. 15, 1901 | P.A. Whitney | Manufacture of Wrench Forgings | making wrenches |
| 684,489 | Oct. 15, 1901 | P.A. Whitney | Manufacture of Wrench Jaws | making wrenches |
| 773,591 | Nov. 01, 1904 | C.D. Rice | Multiple-spindle drill-press | drill presses |
| 826,894 | Jul. 24, 1906 | R.H. Shailer | Handle for tools | tool handles |
| 915,012 | Mar. 09, 1909 | L.G. Bayrer | Drop Press and Attachment Therefor | stamping presses |
| 984,708 | Feb. 21, 1911 | C.D. Rice | Belt-gearing | drill presses |
