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Class Information
Number: 181/20
Name: Acoustics > Speaking tubes > Combined mouth and ear pieces
Description: Mouthpieces and connected earpieces.

Patents under this class:

Patent Number Title Of Patent Date Issued
8434493 Adjustable mouth shield device May. 7, 2013
6768804 Adjustable microphone boom with acoustic valve Jul. 27, 2004
6625293 Microphone Sep. 23, 2003
6092620 Support frame Jul. 25, 2000
5533131 Anti-eavesdropping device Jul. 2, 1996
4926961 Hinged acoustical voice tube May. 22, 1990
4617431 Voice tube assemblies for post-auricle headsets Oct. 14, 1986
4505358 Voice communicator Mar. 19, 1985
4473130 Crash helmet with communication system Sep. 25, 1984
4459707 Ear protecting device Jul. 17, 1984
4118606 Acoustical voice transmitting headset Oct. 3, 1978
4090042 Acoustical communications headset May. 16, 1978
3993879 Acoustical communications headset Nov. 23, 1976

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