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US2043416A - Process of silencing sound oscillations - Google Patents

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US2043416A - Process of silencing sound oscillations - Google Patents Process of silencing sound oscillations Download PDF Info Publication number US2043416A US2043416A US714582A US71458234A US2043416A US 2043416 A US2043416 A US 2043416A US 714582 A US714582 A US 714582A US 71458234 A US71458234 A US 71458234A US 2043416 A US2043416 A US 2043416A Authority US United States Prior art keywords sound oscillations microphone loudspeaker sound wave Prior art date 1933-01-27 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and

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