US PATENT SUBCLASS 91 / 502
.~.~ Including plural axially spaced working chambers (e.g., double-acting working members)

Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

472  DF  THREE OR MORE CYLINDERS ARRANGED IN PARALLEL RADIAL OR CONICAL RELATIONSHIP WITH ROTARY TRANSMISSION AXIS {10}
499  DF  .~ Cylinders parallel to rotation axis {6}
502.~.~ Including plural axially spaced working chambers (e.g., double-acting working members)

DEFINITION

Classification: 91/502

(under subclass 499) Apparatus in which at least one of said plural parallel cylinders is either (1) axially longitudinally spaced relative to another or (2) provided with a piston which divides same into a pair of spaced opposed expansible working chambers.