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| All Patents in class 318/695 | |||||
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| Number | Date | Patentee | Title | Type | |
| 299,552 | Jun. 03, 1884 | W.S. Johnson | Electro-Magnetic Indicator | magnetic transducers | |
| 1,502,840 | Jul. 29, 1924 | C.L. Beard | Electric clock | clockmaker | |