power-operated pumps for conveying solids liquids, semi-liquids and gases and mechanical controls therefor; centrifugal pumps, air compressors, gas compressors, power-operated booster pumps for use as auxiliary fluid pumps, [ vacuum pumps, ] and pneumatic and gas operated ejectors for conveying liquids and the solids entrained therein

'air':20 'auxiliari':32 'booster':27 'centrifug':18 'compressor':21,23 'control':16 'convey':6,44 'ejector':42 'entrain':49 'fluid':33 'gas':22,40 'gase':13 'liquid':8,11,45 'mechan':15 'oper':3,26,41 'pneumat':38 'power':2,25 'power-oper':1,24 'pump':4,19,28,34,36 'semi':10 'semi-liquid':9 'solid':7,48 'therefor':17 'therein':50 'use':30 'vacuum':35

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