Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F04
POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
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F04B
POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
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9/00
Piston machines or pumps characterised by the driving or driven means to or from their working members
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F04B9/12
the fluid being elastic, e.g. steam or air
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F04B9/129
having plural pumping chambers
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F04B9/131
with two mechanically connected pumping members
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F04B9/133
reciprocating movement of the pumping members being obtained by a double-acting elastic-fluid motor
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