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| All Patents in class 307/141.8 | |||||
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| Number | Date | Patentee | Title | Type | |
| 870,900 | Nov. 12, 1907 | C.A. Palmgren, A.H. Young | Time-controlled circuit-closing device | time registers | |
| 1,074,813 | Oct. 07, 1913 | C.A. Palmgren | Time-controlled circuit-closing device | time registers | |