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| Patents for Harry L. Clapp | |||||
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| Number | Date | Patentee | Title | Type | |
| 703,725 | Jul. 01, 1902 | F. Hardinge | Diopter gage | optician | |
| 723,540 | Mar. 24, 1903 | T.C. Menges | Igniter Operating Mechanism for Explosive Engines | ignition systems | |