Title:
Oil well drilling means
United States Patent 2886288


Inventors:
Gehrke, Herman A.
Application Number:
US60533456A
Publication Date:
05/12/1959
Filing Date:
08/21/1956
Assignee:
Gehrke, Herman A.
Primary Class:
Other Classes:
173/198, 175/211, 175/212, 175/325.4
International Classes:
E21B21/00
View Patent Images:
US Patent References:
2742264Impact drill1956-04-17
2716018Apparatus for bore hole drilling1955-08-23
2670046Casing scraper1954-02-23
2641444Method and apparatus for drilling boreholes1953-06-09
1621569Drilling wells1927-03-22
0868565N/A1907-10-15
0758781N/A1904-05-03