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| All Patents in class 340/658 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,041,061 | Oct. 15, 1912 | A. Frisch | Indicating Mechanism | steam engine indicators | |
| 2,634,404 | Apr. 07, 1953 | T.F. Carmichael | Phase indicator | ||