73248639
Feb 4, 1980
Mar 16, 1982
Electronic Fire Protection, Security and Emergency Communications Systems, Either Stand Alone or Multiplexed, Between Remote and Central Locations Including Phone and Monitor Panels, Switch and Pilot Light Panels, Recorded Message Tape Decks, Preamplifiers, Power Amplifiers, Speakers, Horns, Telephone Stations and Jacks and Supervisory Equipment Detector Modules
Electrical and Scientific Apparatus