Title:
Hydraulic casing control head
United States Patent 1802564


Inventors:
Lacey, Joseph S.
Application Number:
US36696129A
Publication Date:
04/28/1931
Filing Date:
05/29/1929
Assignee:
Lacey, Joseph S.
Primary Class:
Other Classes:
83/639.1, 166/55, 166/95.1, 251/63, 251/212
International Classes:
E21B29/08
View Patent Images: