US PATENT SUBCLASS 15 / 317
.~.~.~.~ With blowing element housing or protecting feature, e.g., embedded, disappearing or cooling

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}
301  DF  .~.~ Fixed position cleaners or installed cleaning systems {6}
316.1  DF  .~.~.~ Air blast only (e.g., boiler soot-blower) {3}
317.~.~.~.~ With blowing element housing or protecting feature, e.g., embedded, disappearing or cooling

DEFINITION

Classification: 15/317

(under subclass 316) Apparatus having provisions for cooling

the blower element, as by a draft of air or steam, or in which the blower is retracted or folded against or embedded in the furnace wall in nonblowing position and is projected or moved therefrom during the cleaning operation, or is otherwise protected from the furnace heat.