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| All Patents in class 123/634 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,318,726 | Oct. 14, 1919 | E.E. Chia | Micrometer Gage | micrometers | |
| 1,904,308 | Apr. 18, 1933 | K.A. Harmon | Magneto | ignition systems | |
| 2,921,553 | Jan. 19, 1960 | F.O. Luenberger | Adjustable date indicator | ||