US PATENT SUBCLASS 91 / 493
.~.~ Rigidly connected pistons reciprocate within rigidly connected cylinders

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}
491  DF  .~ Radially disposed cylinders {6}
493.~.~ Rigidly connected pistons reciprocate within rigidly connected cylinders

DEFINITION

Classification: 91/493

(under subclass 491) Apparatus having plural rigidly interconnected cylinders, the piston associated with one of said rigid cylinders being interconnected for unitary movement with the piston associated with nother of said rigid cylinders.