US PATENT SUBCLASS 47 / 903
OPERATOR MEANS FOR COLD FRAME OR WINDOW
Current as of:
June, 1999
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PLANT HUSBANDRY
903
OPERATOR MEANS FOR COLD FRAME OR WINDOW
DEFINITION
Classification: 47/903
Operator means for cold-frame or window:
Subject matter which includes an operator in combination with a greenhouse, cold-frame, or growth chamber to automatically vent excess heat by opening some portion of the structure.
