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Any construction trade other than a Union pipefitter, Union pipefitter welder, or even a Union Plumber.
A short list of support crafts include, but are not limited to:
Iron workers, carpenters, electricians, millwrights, laborers, sheet metal workers, operating engineers.
The iron worker realized he was just a support craft and started crying.
by matt_the_plumber November 02, 2016
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