(under the class definition) Subject matter comprising a hollow part or cavity involving an internal wall structure of one member which receives a male portion (e.g., spigot) of the other member.
SEE OR SEARCH THIS CLASS, SUBCLASS:
374+, for packed socket-typed couplings and see the Search Notes thereunder.
SEE OR SEARCH CLASS
24, Buckles, Buttons, Clasps, etc.,
588+, for a head and socket separable fastener. 279, Chucks or Sockets, appropriate subclasses.
