Flexible corrugated sheet material and method of fabricating same
United States Patent 2642372

Inventors:
Yardley, Chittick Charles
Publication Date:
06/16/1953
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Assignee:
Yardley, Chittick Charles
Primary Class:
428/134
Other Classes:
428/166, 428/138, 428/172, 428/136, 428/121, 428/182, 428/183, 493/463, 428/184
International Classes:
B31F1/28; B31F1/20
Foreign References:
DE618066C