U.S. federal trademark · Serial No. 71624208 · Reg. No. 0572019
ELECTRICAL SUPERVISORY ALARM SIGNALLING APPARATUS WHICH CONSISTS OF AN ENCLOSURE CONTAINING SEVERAL RELAYS, SIGNAL LIGHTS, AND ASSOCIATED WIRING FOR AUTOMATICALLY SUPERVISING INDUSTRIAL-CHEMICAL PROCESSES CAUSING AN AUDIBLE AND VISIBLE ALARM TO BE REGISTERED WHENEVER THE SUPERVISED CONDITION DEPARTS FROM THE NORMAL
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