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| Patents for Helen Graham | |||||
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| Number | Date | Patentee | Title | Type | |
| 432,328 | Jul. 15, 1890 | J.A. Painter | Center and Mortise-Gage | center marking gauges | |
| 475,767 | May 31, 1892 | H.W. Hill | Hog Ring Pinchers | hog ring | |
| 510,994 | Dec. 19, 1893 | T. Schafer | Extensible Measuring Stick | special purpose gauges | |