Interesting use of the term _customary_! To add to the complexity of this, weren’t the customary units of length and mass were defined in the U.S in the late 18

Interesting use of the term _customary_! To add to the complexity of this, weren’t the customary units of length and mass were defined in the U.S in the late 1800’s by reference to international metric standards - the Mendenhall order?