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| All Patents in class 403/56 | |||||
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| Number | Date | Patentee | Title | Type | |
| 924,787 | Jun. 15, 1909 | R. Janney | Variable Speed Transmission Device | industrial machine speed and direction changing mechanisms | |
| 2,073,089 | Mar. 09, 1937 | G. Autenrieth | Gauge Mounting | measurement gauges | |