Closure for pressure vessels
United States Patent 1821726

Inventors:
Alberto, Saporta (IT)
Publication Date:
09/01/1931
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Assignee:
Alberto, Saporta
Primary Class:
220/314
Other Classes:
220/DIG.017, 220/316, 126/20
International Classes:
A47J27/08; A47J27/09; A47J27/092