73833851
Oct 26, 1989
Jan 22, 1991
ELECTRONIC COMMUNICATIONS EQUIPMENT FOR USE UNDER NORMAL AND HIGH INTERFERENCE CONDITIONS, NAMELY, MICROPHONES; EARPHONES; HEADSETS AND HELMETS CONTAINING MICROPHONES AND EARPHONES; TRANSMITTERS; RECEIVERS; TRANSCEIVERS; MEGAPHONES; AND TELEPHONE EQUIPMENT FOR WIRELESS AND LINE TRANSMISSION
Electrical and Scientific Apparatus