Title:
Portable drill rig
United States Patent 2792198


Inventors:
Braun, Leonard A.
Application Number:
US34560953A
Publication Date:
05/14/1957
Filing Date:
03/30/1953
Assignee:
E J LONGYEAR COMPANY
Primary Class:
Other Classes:
173/28, 173/196, 175/85
International Classes:
E21B7/02; E21B15/02; E21B15/04
View Patent Images:
US Patent References:
2665116Posthole boring machine1954-01-05
2451223Drilling apparatus1948-10-12
2410959Earth drill1946-11-12
2334312Drilling machine1943-11-16
2283866Drilling rig1942-05-19
1956200Rotary drill and clean out machine1934-04-24
1718395Tube rack for derricks1929-06-25
1397324Earth-boring machine1921-11-15
1108102N/A1914-08-18