US PATENT SUBCLASS 68 / 228
.~.~.~ Sheet or slab

Current as of: June, 1999
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68 /   HD   TEXTILES: FLUID TREATING APPARATUS

213  DF  IMPLEMENTS {6}
223  DF  .~ Washboards {3}
226  DF  .~.~ Rubbing surfaces {4}
228.~.~.~ Sheet or slab {1}
229  DF  .~.~.~.~> Surface design or elevation

DEFINITION

Classification: 68/228

Washboards wherein the scrubbing surface is of a single sheet or slab of material.