US PATENT SUBCLASS 15 / 221
.~.~.~ Collection chamber

Current as of: June, 1999
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15 /   HD   BRUSHING, SCRUBBING, AND GENERAL CLEANING

104.001  DF  IMPLEMENTS {28}
208  DF  .~ Fabric {1}
209.1  DF  .~.~ Wiper, dauber, or polisher {12}
221.~.~.~ Collection chamber

DEFINITION

Classification: 15/221

Implements having fabric working faces adapted to act as wipers or polishers, and a chamber for collection of material dislodged by the implement, principally blackboard erasers with chambers for collection of chalk-dust.