Interlocking window framing system
United States Patent 3340663
US Patent References:
Metal construction element
- - 3081850

/3125194.html
- - 3125194

Curtain wall
- - 3140763


Inventors:
Collard, Earl W.
Publication Date:
09/12/1967
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Assignee:
Collard, Earl W.
Primary Class:
52/775
Other Classes:
52/846, 52/212, 52/204.700, D25/60
International Classes:
E04B2/96; E06B1/02; E04B2/88; E06B1/00