Google Patents US1887273A - Circuit controllerÄownload PDF Info Publication number US1887273A US1887273A US475440A US47544030A US1887273A US 1887273 A US1887273 A US 1887273A US 475440 A US475440 A US 475440A US 47544030 A US47544030 A US 47544030A US 1887273 A US1887273 A US 1887273A Authority US United States Prior art keywords shaft bracket circuit controller cam contact Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
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