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| Patents for Hart Manufacturing Company | |||||
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| Number | Title | Classification(s) | |||
| 46,191 | Improved Machine for Indicating Carpenters' Squares | 33/19.1 | |||
| 93,449 | Improvement in Machine for Graduating Carpenters' Squares | 33/19.1 | |||
| 110,623 | Improvement in Machines for Marking Squares | 101/5 | |||