42 CENTRAL STATION ALARM SERVICES-NAMELY, MONITORING OF BURCLAR, HOLDUP AND FIRE ALARM SYSTEMS, AND ADVISING POLICE AND/OR DISPATCHING GUARDS; MONITORING OF PROTECTIVE AND SIGNALING DEVICES, SUCH AS BELL-TYPE LOCAL AND REMOIE BURGULAR ALARMS, AND POLICE CONNECTS; INDUSTRIAL CENTRAL STATION SUPERVISION SERVICES AND ELEVATOR MONITORING SERVICES; SECURITY SERVICES-NAMELY, PROVISION OF ARMED ESCORTS; CLOSED CIRCUIT TELEVISION SURVEILLANCE, BOTH MANNED AND UNMANNED; DETECTION OF EAVESDROP AND WIRE TAP DEVICES; POLYGRAPH EXAMINATIONS; PREEMPLOYMENT CHECKS; UNDERCOVER SERVICES TO UNMASK DISHONEST EMPLOYEES; SURVEILLANCE OF INDIVIDUALS OR VEHICLES; TECHNICAL SURVEILLANCE; CONSULTANT SERVICES IN FVALUATING SPECIFIC DEVICES BEING CONTEMPLATED FOR USE BY CLIENTS IN H'GH-RISK SITUATIONS; AND QUESTIONED DOCUMENT ANALYSIS (HANDWRITING IDENTIFICATION)