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| Patents for Alfred H. Crockford | |||||
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| Number | Date | Patentee | Title | Type | |
| 206,006 | Jul. 16, 1878 | A.H. Crockford | Improvement in bit-clamps | brace chucks | |
| 223,484 | Jan. 13, 1880 | A.H. Crockford | Bit-brace | braces | |