US PATENT SUBCLASS 454 / 290
.~.~.~ Having adjustable valve

Current as of: June, 1999
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454 /   HD   VENTILATION

254  DF  HAVING INLET AIRWAY {11}
284  DF  .~ Including specific air distributor (e.g., register, etc.) {14}
289  DF  .~.~ Floor type {2}
290.~.~.~ Having adjustable valve

DEFINITION

Classification: 454/290

Having adjustable valve:

(under subclass 289) Subject matter comprising a positively repositionable device for regulating the quantity of airflow.