All Patents in class 236/45


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All Patents in class 236/45
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	2,141,711	Dec. 27, 1938	B.M. Guthrie	Automatic Air Control Means
	2,218,930	Oct. 22, 1940	N. Cunningham	Automatic draft control
	2,351,878	Jun. 20, 1944	P.S. Russel	Controlling Means
	2,456,131	Dec. 14, 1948	W.S. Landon	Draft Control Means for Fuel Burners