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| Patents for Hart Manufacturing Company | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 46,191 | Jan. 31, 1865 | H.K. Jones | Improved Machine for Indicating Carpenters' Squares | |
 | 93,449 | Aug. 10, 1869 | H.K. Jones | Improvement in Machine for Graduating Carpenters' Squares | |
 | 110,623 | Jan. 03, 1871 | C.S. Bement | Improvement in Machines for Marking Squares | |