Grid or grating structure
United States Patent 2114773

Inventors:
Auten, Claude I.
Snodgrass, Robert D.
Schulz, Walter F.
Publication Date:
04/19/1938
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Assignee:
TRUSCON STEEL CO
Primary Class:
52/318
Other Classes:
52/338, 14/73
International Classes:
E01D19/12