US PATENT SUBCLASS 220 / 3.4
.~.~ Concrete, lath or plaster engaging means

Current as of: June, 1999
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220 /   HD   RECEPTACLES

3.2  DF  OUTLET OR JUNCTION BOX TYPE {5}
3.3  DF  .~ Wall, floor, or panel mounted {2}
3.4.~.~ Concrete, lath or plaster engaging means

DEFINITION

Classification: 220/3.4

(under subclass 3.3) Receptacles having means specialized for mounting in or for engaging concrete, laths or plaster.

(1) Note. This subclass includes devices for keeping plaster, concrete, paint, etc., out of the box during the plastering, painting or other operations.