Title:
Apparatus for cementing wells
Document Type and Number:
United States Patent 2161284
Inventors:
Crowell, Erd V.
Plaque It!
Sponsored by: Flash of Genius |
Publication Date:
06/06/1939
View Patent Images:
Images are available in PDF form when logged in. To view PDFs, Login or
Create Account (Free!)
Referenced by:
Export Citation:
Assignee:
Crowell, Erd V.
Primary Class:
Other Classes:
166/155, 137/515.500, 137/543.130, 137/375, 166/327, 137/625.250, 251/107, 166/238
International Classes:
E21B21/10; E21B33/16; E21B21/00; E21B33/13