US PATENT SUBCLASS 92 / 152
.~.~ With different cross-sectional areas

Current as of: June, 1999
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92 /   HD   EXPANSIBLE CHAMBER DEVICES

146  DF  PLURAL UNITARILY MOUNTED CYLINDERS OR FRAME THEREFOR (161) {2}
151  DF  .~ Coaxial cylinders (150) {1}
152.~.~ With different cross-sectional areas

DEFINITION

Classification: 92/152

(under subclass 151) Apparatus in which the cross sectional area of a first of said cylinders is smaller than the cross sectional area of a second of said cylinders.