Title:
Control device for oil or gas wells
United States Patent 1851894


Inventors:
Clough, Alfred N.
Application Number:
US31700028A
Publication Date:
03/29/1932
Filing Date:
11/03/1928
Assignee:
Franklin, Hamilton H.
Henry, Hickey J.
Primary Class:
Other Classes:
137/560, 166/95.1
International Classes:
E21B33/06
View Patent Images: