|
US2673128A
|
|
Earth-boring drill
|
|
US2026323A
|
|
Reamer cutter assembly for earth boring drills
|
|
US2009299A
|
|
Earth boring drill
|
|
US2004013A
|
|
Antifriction bearing assembly for drills
|
|
US2004012A
|
|
Roller cutter and spindle assembly for earth boring drills
|
|
US1999132A
|
|
Reamer for earth boring drills
|
|
US1997345A
|
|
Roller cutter assembly for earth boring drills
|
|
US2009300A
|
|
Roller cutter organization for earth boring drills
|
|
US1999131A
|
|
Earth boring drill
|
|
US1923328A
|
|
Antifriction coupling for drill stems
|
|
US1737893A
|
|
Well-casing elevator
|
|
US1692793A
|
|
Earth-boring drill
|
|
US1776043A
|
|
Well-casing holder and elevator
|
|
US1649859A
|
|
Earth-boring drill
|
|
US1636668A
|
|
Earth-boring tool
|
|
US1636666A
|
|
Earth-boring drill
|
|
US1636665A
|
|
Earth-boring drill
|
|
US1649858A
|
|
Deep-well-drilling apparatus
|
|
US1636667A
|
|
Deep-well-drilling apparatus
|
|
US1636664A
|
|
Rotary deep-well-drilling apparatus
|
