APPARATUS FOR COMMUNICATION BETWEEN PERSONNEL INVOLVED IN FIRE-FIGHTING, RESCUE OPERATIONS, AND OTHER HAZARDOUS DUTIES-NAMELY, VOICE COMMUNICATION APPARATUS ESPECIALLY ADAPTED FOR USE BETWEEN WEARERS OF BREATHING APPARATUS; AND DISTRESS SIGNALING APPARATUS ADAPTED TO BE CARRIED BY HAZARDOUS DUTY PERSONNEL FOR SELECTIVELY SOUNDING AN AUDIBLE ALARM IN EMERGENCIES OR THE LIKE
APPARATUS FOR COMMUNICATION BETWEEN PERSONNEL INVOLVED IN FIRE-FIGHTING, RESCUE OPERATIONS, AND OTHER HAZARDOUS DUTIES-NAMELY, VOICE COMMUNICATION APPARATUS ESPECIALLY ADAPTED FOR USE BETWEEN WEARERS OF BREATHING APPARATUS; AND DISTRESS SIGNALING APPARATUS ADAPTED TO BE CARRIED BY HAZARDOUS DUTY PERSONNEL FOR SELECTIVELY SOUNDING AN AUDIBLE ALARM IN EMERGENCIES OR THE LIKE
APPARATUS FOR COMMUNICATION BETWEEN PERSONNEL INVOLVED IN FIRE-FIGHTIN...