Apparatus for use in forming concrete slabs
United States Patent 3109217

Inventors:
Kell, Waldo R.
Publication Date:
11/05/1963
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Assignee:
LAWRENCE PAPER CO
Primary Class:
Other Classes:
249/DIG.002, 425/DIG.106
International Classes:
B28B7/16; B28B7/34
US Patent References:
2823442Carton form
2881501Concrete box-form construction