Patent US1118637A successfully refreshed from Google Patents.
Patent DE356391C successfully refreshed from Google Patents.
DE356391C
Expired / Lapsed
DE
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Alternating current loudspeaker without breaker contact, in which the oscillations of the armature and hammer are caused by the periods of the alternating current
Assignee: Grothe & Soehne A
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Filing: —
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Granted: 1922-07-20
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Expires: 1939-07-20
Abstract
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Inventors
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Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-08 18:24
CPC Classifications
G; G10; G10K; G10K1/00; G10K1/06; G10K1/062; G10K1/063; G10K1/064
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