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| Patents for George H. Martin | |||||
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| Number | Date | Patentee | Title | Type | |
| 164,209 | Jun. 08, 1875 | J.H. Potts | Improvement in Adjustable Mechanisms for Dividers, Compasses and Calipers | calipers | |
| 329,253 | Oct. 27, 1885 | C.P. Bachelder | Burglar-alarm | ||