(under subclass 681) Apparatus in which separable parts of an implement have portions which interfit or interengage to lock the parts against movement in at least three directions spaced 90 deg. apart in a single plane before the addition of any separate fastening means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
704, for interlocked tool parts in which one of the tool parts is reversible.
749+, for similar devices in which no separate fastening means is employed.
