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