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Chirana Praha np
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Chirana Praha np
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Publication of FR1215631ApublicationCriticalpatent/FR1215631A/en
G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
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FR772837A1957-08-191958-08-19 damping element of an electro-acoustic generator for non-destructive testing by ultrasonic pulse deviceExpiredFR1215631A (en)