US PATENT SUBCLASS 414 / 149
.~ Driven, rotatable chamber

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414 /   HD   MATERIAL OR ARTICLE HANDLING

147  DF  CHAMBER OF A TYPE UTILIZED FOR A HEATING FUNCTION AND MATERIAL CHARGING OR DISCHARGING MEANS THEREFOR {6}
149.~ Driven, rotatable chamber

DEFINITION

Classification: 414/149

Driven, rotatable chamber:

(under subclass 147) Apparatus in which the heating chamber is rotatably driven through at least 360 deg. about an axis which passes through the chamber (e.g., a rotary-cement kiln).