US PATENT SUBCLASS 411 / 381
.~.~.~ And telltale bore

Current as of: June, 1999
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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

378  DF  EXTERNALLY THREADED FASTENER ELEMENT, E.G., BOLT, SCREW, ETC. {16}
379  DF  .~ Stay bolt {2}
380  DF  .~.~ Having spherical head {1}
381.~.~.~ And telltale bore

DEFINITION

Classification: 411/381

And telltale bore:

(under subclass 380) Subject matter wherein the fastening means is provided with a longitudinal extending cavity.

(1) Note. Telltale bores are provided to facilitate visual observation of a rupture in a stay bolt.

SEE OR SEARCH THIS CLASS, SUBCLASS:

382, for a threaded stay bolt without a spherical head but having a telltale bore.