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2994400
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Information
Patent Grant
2994400
References
Source
Patent Number
2,994,400
Date Filed
Not available
Date Issued
Tuesday, August 1, 1961
62 years ago
CPC
E04B1/84 - Sound-absorbing elements
B65D90/044 - fixed or supported over substantially the whole interface
G10K11/02 - Mechanical acoustic impedances Impedance matching
G10K11/165 - Particles in a matrix
E04B2001/8419 - Acoustical cones or the like
US Classifications
181 - Acoustics
106 - Compositions: coating or plastic
367 - Communications, electrical: acoustic wave systems and devices
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