Well device
United States Patent 2220359

Inventors:
Tschappat, Sheridan P.
Publication Date:
11/05/1940
View Patent Images:
Download PDF 2220359 pdf       PDF help
Export Citation:
Click for automatic bibliography generation
Assignee:
Tschappat, Sheridan P.
Primary Class:
166/88.300
Other Classes:
166/75.140, 277/510, 403/204, 285/123.600, 277/329, 277/507
International Classes:
E01F9/03; E21B33/06; E01F9/011; E21B33/03