Iron. 15th census of United States [1930]: Manufactures, 1929, industry series, iron and steel, blast furnaces; steel works and rolling mills; tin plate and terneplate; wire, drawn from purchased bars or rods; wirework, not elsewhere classified; cast-iron pipe; bolts, nuts, washers, and rivets, not made in plants operated in connection with rolling mills; forgings, iron and steel, not made in plants operated in connection with rolling mills; nails, spikes, etc., not made in wire mills or in plants operated in connection with rolling mills; springs, steel, except wire, not made in plants operated in connection with rolling mills; wrought pipe, welded and heavy riveted, not made in plants operated in connection with rolling mills.

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