merchant bar
Webster's Dictionary (GCIDE)
Merchant \Mer"chant\, a. Of, pertaining to, or employed in, trade or merchandise; as, the merchant service. [1913 Webster]
Merchant bar, Merchant iron or Merchant steel, certain common sizes of wrought iron and steel bars.
Merchant service or Merchant marine, the mercantile marine of a country. --Am. Cyc.
Merchant ship, a ship employed in commerce.
Merchant tailor, a tailor who keeps and sells materials for the garments which he makes. [1913 Webster]