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| Patents for H. E. Hart | |||||
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| Number | Title | Classification(s) | |||
| 591,528 | Wrench | 81/167, 81/177.1 | |||
| 684,488 | Manufacture of Wrench Forgings | 76/114, 81/171 | |||
| 684,489 | Manufacture of Wrench Jaws | 76/114 | |||
| 773,591 | Multiple-spindle drill-press | 474/150, 474/86 | |||
| 826,894 | Handle for tools | 279/95 | |||
| 915,012 | Drop Press and Attachment Therefor | 72/439, 72/456 | |||
| 984,708 | Belt-gearing | 474/63, 74/665.0GB, 74/665.0GE | |||