GS Fish Neck Profile

[blckwtr]

A lot of oil companies use this term, but they don't know what GS is shortened from - including me. What does GS stand for, and what is the terms GU shear adapter which makes up the GR shear up tool (american oil tools) ?

 

[BigInch]

Otis Engineering model designations "GR" & "GS". Don't seem to have any meaning in words.

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