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| All Patents in class 346/102 | |||||
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| Number | Date | Patentee | Title | Type | |
| 578,283 | Mar. 02, 1897 | W.L. Bundy | Recording Apparatus | metering apparatus | |
| 871,849 | Nov. 26, 1907 | F.L. Wolfe | Recording Counter | rpm speed gauges and tachometers | |