Protecting coating
United States Patent 2241493

Inventors:
Thiel, Heinrich Van
Publication Date:
05/13/1941
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Assignee:
Walter, Duisberg H.
Primary Class:
427/238
Other Classes:
427/239, 220/917
International Classes:
C04B41/50; C04B41/66; C04B41/45; C04B41/60