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No plans shall be approved for permit unless such plans are signed and sealed either by an architect licensed to practice architecture, as provided by the Illinois Architectural Act, or by a structural engineer licensed to practice structural engineering, as provided by the Illinois Structural Engineering Act, or by a registered professional engineer licensed to practice professional engineering as provided by The Illinois Professional Engineering Act, provided, however, that the person who signs and seals such plans shall be permitted to do so within the limitations of the particular act under which he is licensed to practice, and provided further, that plans for installations which involve the design of or changes in the supporting structure or which materially affect the structural loadings must be signed and sealed by an architect or structural engineer duly licensed as aforesaid.
(Prior code § 45-2)