US PATENT SUBCLASS 52 / 363
.~.~.~ Backer penetrated

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

344  DF  SETTABLE MATERIAL RECEIVING BACKER FIXED TO FURRING, JOIST, OR STUD {11}
361  DF  .~ Impaling-type fastener {1}
362  DF  .~.~ Support penetrated {1}
363.~.~.~ Backer penetrated

DEFINITION

Classification: 52/363

(under subclass 362) Structure in which the fastener also passes into the material of the backer.