United States Patent 3123098
US Patent References:
Louver construction
- - 1996340

Radiator shutter unit
- - 2207147

Valve
- - 2299802

Pivoted louver with seating pad
- - 2311950

Ventilator shutter
- - 2355412


Publication Date:
03/03/1964
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Primary Class:
137/601.060
Other Classes:
49/92.100, 251/298, 137/527, 137/601.090, 49/91.100, 454/318
International Classes:
F24F13/15
US Patent References:
2390227Damper construction
2654921Weather seal for jalousie windows
2685246Air register