Method of making ring type packings
United States Patent 2400533

Inventors:
Buffington, Malcolm R.
Publication Date:
05/21/1946
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Assignee:
LEA FABRICS INC
Primary Class:
264/137
Other Classes:
277/335, 156/194, 277/436, 277/336, 277/924, 264/258
International Classes:
E21B37/10; F16J15/24; E21B37/00; F16J15/18