Title:
Doorway construction
United States Patent 2823429
US Patent References:
Door and window structure
- - 2506978


Inventors:
Grant, James B.
Publication Date:
02/18/1958
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Assignee:
Grant, James B.
Primary Class:
49/67
Other Classes:
454/195
International Classes:
E06B1/52; E06B7/28; E06B7/00
Foreign References:
GB188614848A