Valved tap plug
United States Patent 2172311

Inventors:
Thomas, Rosswell W.
Publication Date:
09/05/1939
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Assignee:
PHILLIPS PETROLEUM CO
Primary Class:
222/3
Other Classes:
285/212, 251/354, 251/340, 137/322, 285/334.300, 220/89.400, 137/454.500, 220/288, 220/375
International Classes:
F16K21/04; F17C13/04; F16K21/00