US PATENT SUBCLASS 15 / 346
.~.~.~ Closed circuit systems, i.e., air recirculating

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

3  DF  MACHINES {11}
300.1  DF  .~ With air blast or suction {26}
345  DF  .~.~ Air blast with suction {1}
346.~.~.~ Closed circuit systems, i.e., air recirculating

DEFINITION

Classification: 15/346

(under subclass 345) Apparatus in which the cleaning air is recirculated in a substantially closed circuit, usually the intake side of the pump being the source of suction and the outlet side being the source of pressure.