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| Patents for Frank F. Spencer | |||||
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| Number | Date | Patentee | Title | Type | |
| 524,952 | Aug. 21, 1894 | E.C. Phillips | Bit With Replaceable Wood-Screw Lead | drill bits | |
| 529,832 | Nov. 27, 1894 | E.C. Phillips | Bit With Replaceable Wood-Screw Lead | drill bits | |