|
US2223388A
|
|
Cementing head
|
|
US2303392A
|
|
Shear-relief valve
|
|
US2248124A
|
|
Well casing attachment
|
|
US2248125A
|
|
Wash-down and cementing attachment for well casings
|
|
US2257765A
|
|
Cementing device for well casings
|
|
US2254246A
|
|
Apparatus for cementing wells
|
|
US2208603A
|
|
Apparatus for cementing wells
|
|
US2208604A
|
|
Sounding apparatus for wells or the like
|
|
US2275474A
|
|
Measuring apparatus for determining the depth of oil wells or the like
|
|
US2320670A
|
|
Well casing attachment
|
|
US2275473A
|
|
Well cementing apparatus
|
|
US2253537A
|
|
Apparatus for cementing wells
|
|
US2253536A
|
|
Apparatus for cementing wells
|
|
US2217708A
|
|
Well cementing method and apparatus
|
