US PATENT SUBCLASS 277 / FOR 122
.~.~.~ Expanding and contracting (277/120)

Current as of: June, 1999
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277 /   HD   SEAL FOR A JOINT OR JUNCTURE

FOR 100  DF  RADIALLY CONTAINED PACKING WITH AXIALLY ACTING FOLLOWER (277/102) {15}
FOR 119  DF  .~ Wedging surfaces (277/117) {2}
FOR 121  DF  .~.~ Split or segmental packing (277/119) {2}
FOR 122.~.~.~ Expanding and contracting (277/120) {1}
FOR 123  DF  .~.~.~.~> Elastomeric (277/121)

DEFINITION

Classification: 277/FOR.122

Foreign art collections wherein one packing member or segment expands and another packing member or segment contracts due to the action of the follower.