(under subclass 249) Apparatus including means formed of a material other than the material forming the flexible nonmetallic portion of the piston, said means being embedded in the flexible nonmetallic portion for reinforcing the same.
SEE OR SEARCH THIS CLASS, SUBCLASS:
241, for a piston having a peripheral axially extending flexible lip provided with a reinforcing means embedded in the lip. Note "Statement Relating To Placement Of Patents Involving Combination And Subcombination Subclasses" of the Class Definition and the paragraph following the title in the schedule of this class.