21 ELECTRICALLY ACTUATED MUNICIPAL FIRE ALARM SYSTEMS; POLICE SIGNAL SYSTEMS; INDUSTRIAL FIRE ALARM SYSTEMS; SUPERVISORY SYSTEMS; CENTRAL OFFICE FIRE ALARM CONTROL SWITCHBOARDS; FIRE ALARM MASTER BOX TRIP CABINETS; SMOKE DETECTOR ALARM SYSTEMS AND MISCELLANEOUS ANCILLARY EQUIPMENT ASSOCIATED WITH AND IN SUPPORT OF SAID FIRE AND SMOKE ALARM SYSTEMS