US PATENT SUBCLASS 33 / 409
.~.~.~.~ By line tension only

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

403  DF  STRAIGHTEDGE TYPE {16}
404  DF  .~ Wall guide and plumb (e.g., building construction) {3}
407  DF  .~.~ Building is the vertical support {1}
408  DF  .~.~.~ Connected to brick {2}
409.~.~.~.~ By line tension only

DEFINITION

Classification: 33/409

By line tension only:

(under subclass 408) Subject matter wherein the wall guide is a line which is stretched by a spring-type mechanism from one end of a brick wall portion to another.