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Meets OSHA Standard 29 CFR1923.909(a) Made of aluminum, sized 18" x 24"Wording:BLASTING SIGNALSWARNING SIGNAL:A 1-MINUTE SERIES OF LONG BLASTS5 MINUTES PRIOR TO BLAST SIGNALBLASTING SIGNAL:A SERIES OF SHORT BLASTS1-MINUTE PRIOR TO THE SHOTALL CLEAR SIGNAL:A PROLONGED BLAST FOLLOWINGTHE INSPECTIONS OF THE BLAST AREA
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