US PATENT SUBCLASS 418 / 222
SEPARABLE ABUTMENT

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

222SEPARABLE ABUTMENT

DEFINITION

Classification: 418/222

(under the class definition) Apparatus in which an abutment comprises a plurality of relatively movable elements or portions which part to allow a working portion of the working member to pass therebetween.