US PATENT SUBCLASS 52 / 683
.~.~.~.~ Block-type stop

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

633  DF  OPENWORK; E.G., TRUSS, TRELLIS, GRILLE, SCREEN, FRAME, OR REBAR CHAIR {12}
677  DF  .~ Spacer-positioner; e.g., rebar chair {5}
679  DF  .~.~ Penetrator with limiting stop {2}
681  DF  .~.~.~ Penetrating leg traversing separate stop {2}
683.~.~.~.~ Block-type stop

DEFINITION

Classification: 52/683

(under subclass 681) Structure in which the stop or spacer is a mass of material whose depth is substantial relative to its longitudinal and lateral dimensions.