Air vent
United States Patent 2802410
US Patent References:
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Ventilator wall and window blocks
- - 2216420

Casement for portholes and the like
- - 2309255

Opposed louver ventilator
- - 2509016

Ventilating wall block
- - 2565122


Inventors:
Robinson, Albert P.
Publication Date:
08/13/1957
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Assignee:
Robinson, Albert P.
Primary Class:
454/279
Other Classes:
454/283
International Classes:
F24F13/08
Foreign References:
GB336432A
FR1012492A