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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 |
| 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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