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Improvements in and relating to Pumps used in connection with Diving Operations.
Improvements in and relating to Pumps used in connection with Diving Operations.
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机译:与潜水作业相关的泵的改进和相关要求。
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12,078. Schydlowski, F. Aug. 21. Check or n o n - r e t u r n valves.-A circular flap valve for gas pumps used in driving operations consists of a flexible disk 40 provided with a metallic stiffening facing-ring 42.
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