Number | Name | Date | Kind |
---|---|---|---|
3735827 | Berryman | May 1973 | |
3804185 | Mason | Apr 1974 | |
3880248 | Mason | Apr 1975 | |
4361195 | Evans | Nov 1982 | |
4582148 | Walter | Apr 1986 | |
5086853 | Evans | Feb 1992 | |
5123493 | Wenzel | Jun 1992 | |
5318139 | Evans | Jun 1994 | |
5431221 | Roberts et al. | Jul 1995 |
Number | Date | Country |
---|---|---|
1082682 | Jul 1980 | CAX |
Entry |
---|
Brochure of Houston Engineers, Inc. published 1985 re Hydra-Jar. |
Brochure of Dailey Petroleum Services Corp. published 1991 re Hydraulic Drilling Jar. |