US PATENT SUBCLASS 454 / 908
HAVING ROTARY RETARDER
Current as of: June, 1999
Click HD for Main Headings
Click for All Classes
DEFINITION
Classification: 454/908
HAVING ROTARY RETARDER:
(under the class definition) Subject matter comprising a means in the path of air flowing to or from a ventilated space which is made to revolve about an axis by the airflow.
(1) Note. The means must revolve at least 360 degrees to be included in this art collection.
