Title:
Core block door construction
United States Patent 2822870
Inventors:
Haynes, John W.
Publication Date:
02/11/1958
Export Citation:
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Assignee:
Haynes, John W.
Primary Class:
160/380
Other Classes:
52/455
International Classes:
E06B3/74; E06B3/70; E06B3/72; E06B3/70
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US Patent References:
2695664Framed panel and the manufacture thereof
2020044Door construction
1540932Sound-insulating partition