U.S. federal trademark · Serial No. 72131403 · Reg. No. 0735725
PORTABLE BREATHING APPARATUS COMPRISING A TANK OF COMPRESSED AIR WHICH NORMALLY SUPPLIES THE REQUIRED BREATHING AIR; A PRESSURE REGULATOR; A DEMAND VALVE; AND A MEANS FOR SHORT CIRCUITING SAID REGULATOR AND FOR TUBULARLY CONNECTING THE APPARATUS TO A SOURCE OF LOW PRESSURE AIR WHENEVER THE LATTER IS AVAILABLE
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