Title:
Automatic roof ventilator control
United States Patent 3027090
US Patent References:
/1114246.html
- - 1114246

Commutator-cylinder
- - 1358736

Thermostatic appliance
- - 1833950

Railway car
- - 1915149

Ventilating damper
- - 1926120


Inventors:
Zerhan Jr., Peter
Publication Date:
03/27/1962
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Assignee:
Zerhan Jr., Peter
Primary Class:
236/49.500
Other Classes:
454/260, 454/366, 454/358
International Classes:
F24F7/02
US Patent References:
2252179Ventilator
2314003Counterbalanced louver construction
2624265Spring counterbalanced louver mechanism
2698570Temperature control air deflecting louver
2927736Apparatus for cooling a device which produces heat during the operation thereof
2987256Fluid control assembly