If the machine is designed to not to be held in hand then it is classified under Schedule B 84.79.89.9898 (8479.89.9897 HTSUS) pursuant to NY L86502.
If it is designed to be held in hand during its use, it is classified under Schedule B 8467.11.5040 (Tools for working in the hand, pneumatic, hydraulic or with self-contained electric or nonelectric motor, and parts thereof: other: other wrenches)
I believe that there's no need to waste time looking for more information on this subject when we have your article. Very good job!