.~ Spaced faces joined by rigid stem (e.g., spool)
DEFINITION
Classification: 92/175
(under subclass 172) Apparatus in which the piston includes a pair of axially spaced portions each of which includes an end face and a side wall, said spaced portions being rigidly joined by a portion of smaller peripheral extent than the spaced portions.
SEE OR SEARCH THIS CLASS, SUBCLASS:
138, for a piston provided with spaced faces joined by a rigid stem, in which the stem is provided with a linkage or transmission engaging portion.
