71530793
Aug 7, 1947
Dec 19, 1950
EJECTORS, SEWAGE EJECTORS, PNEUMATIC VALVES FOR USE IN THE CONTROL SYSTEMS OF PNEUMATIC EJECTORS AND PUMPS, PNEUMATIC PUMPS AND EJECTORS FOR CONVEYING SOLIDS, LIQUIDS, AND SEMI-LIQUIDS, AND CONTROLS THEREFOR
Yarns and Threads