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US334823A - Commutator for dynamo-electric …

US334823A US1885164534A US334823A US 334823 A US334823 A US 334823A US 1885164534 A US1885164534 A US 1885164534A US 334823 A US334823 A US 334823A Authority US United States Prior art keywords commutator dynamo electric machines brush material Prior art date 1885-05-06 Legal status (The legal status is an assumption and is not a legal conclusion.

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