Title:
Cushioning flow fitting for oil wells
United States Patent 1436417

Inventors:
Trumble, Milon J.
Publication Date:
11/21/1922
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Assignee:
Trumble, Milon J.
Primary Class:
251/123
Other Classes:
138/42, 137/601.180, 137/75
International Classes:
E21B33/04; E21B33/03