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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Steelmaker's need 12 letters:

BLASTFURNACE: Steelmaker's need
IRONORE: Steelmaking need
COKE: Steelmaking need
STEAMPOWER: Steelmaking need
IRON: Steelmaking need
COKE: Steelmaker's need