Title:
Insulated tile unit and structure
United States Patent 2097892

Inventors:
Powell, Edward R.
Publication Date:
11/02/1937
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Assignee:
Powell, Edward R.
Primary Class:
52/396.090
Other Classes:
52/603, 52/600, 52/405.100
International Classes:
E04C2/288; E04C2/26