Title:
Well drilling device
United States Patent 2637527
US Patent References:
/0478791.html
- - 0478791
/0840148.html
- - 0840148
/1315422.html
- - 1315422
Boring device and method for the production of vertical boreholes
- - 1411896
Apparatus for indicating angularity of crooked well holes
- - 1868833
/0478791.html
- - 0478791
/0840148.html
- - 0840148
/1315422.html
- - 1315422
Boring device and method for the production of vertical boreholes
- - 1411896
Apparatus for indicating angularity of crooked well holes
- - 1868833
Inventors:
Andrews Jr., Joseph B.
Publication Date:
05/05/1953
View Patent Images:
Export Citation:
Assignee:
Andrews Jr., Joseph B.
Primary Class:
Other Classes:
175/99, 175/104, 173/35, 175/45, 173/152, 173/197
International Classes:
E21B4/04; E21B4/18; E21B7/06; E21B47/024; E21B4/00; E21B7/04; E21B47/02
US Patent References:
| 2192909 | Diamond drill |
Foreign References:
| GB126804A | ||||
| DE317663C | ||||
| DE347356C |