Title:
Ventilating wall block
United States Patent 2565122
US Patent References:
/0104486.html
- - 0104486

/0872979.html
- - 0872979

/1204321.html
- - 1204321

Wall box
- - 1493875

/1705418.html
- - 1705418


Inventors:
Nathan, Cowan
Publication Date:
08/21/1951
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Assignee:
AIR RECTIFIERS INC
Primary Class:
454/273
Other Classes:
49/368, 52/302.100, 454/309, D25/58, D25/108
International Classes:
E04C1/42; F24F7/00; E04C1/00
US Patent References:
1816769Sound suppressing ventilator fitment for wall apertures
2092673Window ventilator
2132263Air conditioner
2273758Window and wall ventilator
2390394Window
Foreign References:
GB161314A
GB405785A