US PATENT SUBCLASS 91 / 156
.~ Concentric working chambers

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

152  DF  MULTIPLE EXPANSION {7}
156.~ Concentric working chambers

DEFINITION

Classification: 91/156

(under subclass 152) Apparatus wherein one of the working chambers surrounds another working chamber, said chambers having a common axis.