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Aluminum, magnesium and other lightweight metals and alloys shall be used for structural members of buildings and other structures only after approval by the building commissioner of working stresses in compliance with accepted engineering practice.
(Prior code § 74-4; Amend Coun. J. 9-13-89, p. 4604; Amend Coun. J. 3-5-03, p. 104990, § 32; Amend Coun. J. 11-13-07, p. 14999, Art. II, § 1)