US2648116A
|
|
Method of making hollow monolithic concrete slabs
|
US2373323A
|
|
Process and apparatus for pressure core drilling
|
US2137296A
|
|
Well fluid sampler
|
US2070836A
|
|
Method for obtaining fluid samples from drilled wells
|
US2099859A
|
|
Collapsible rotary core drill
|
US2040619A
|
|
Method and apparatus for obtaining fluid samples from drilled wells
|
US1996771A
|
|
Method and apparatus for placer mining
|
US1941610A
|
|
Process for decomposing ores
|
US1941609A
|
|
Process for decomposing ores
|
US1895001A
|
|
Core drill
|
US1921472A
|
|
Production tester
|
US1895000A
|
|
Orientation core drill
|
US1894999A
|
|
Core barrel nose
|
US1894998A
|
|
Rotary core drill
|
US1894997A
|
|
Mud guard for core drills
|
US1894996A
|
|
Core drill with clock operated photographic means for ascertaining dip
|
US1896492A
|
|
Method of obtaining samples from drilled wells
|
US1894995A
|
|
Core drill and means for ascertaining dip
|
US1697534A
|
|
Car-cleaning device
|
US1697249A
|
|
Method of making production tests in oil wells
|