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DATA TRANSMISSION SYSTEM FOR USE IN AUTOMATIC CONTROL OF MACHINERY AND EQUIPMENT USED IN MINING AND UNDERGROUND BUILDING INDUSTRIES, IN PARTICULAR ELECTROHYDRAULIC CONTROL OF SELF-ADVANCING ROOF SUPPORTS
DATA TRANSMISSION SYSTEM FOR USE IN AUTOMATIC CONTROL OF MACHINERY AND EQUIPMENT USED IN MINING AND UNDERGROUND BUILDING INDUSTRIES, IN PARTICULAR ELECTROHYDRAULIC CONTROL OF SELF-ADVANCING ROOF SUPPORTS