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SYSTEM FOR START-UP AND STOPPING OF AN AIR DRIVEN ENGINE OPERATING IN MINES UNDER METHANE HAZARD CONDITIONS AND FOR TRANSMITTING AND LIQUIDATING AN ALARM SIGNAL BEFORE START-UP OF SUCH AN ENGINE
SYSTEM FOR START-UP AND STOPPING OF AN AIR DRIVEN ENGINE OPERATING IN MINES UNDER METHANE HAZARD CONDITIONS AND FOR TRANSMITTING AND LIQUIDATING AN ALARM SIGNAL BEFORE START-UP OF SUCH AN ENGINE
