Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 331
that portion of theframe that projects within the reveal is formed to provide ahanging style. Hollow air chamber construction throughout, made of 24gauge galvanized sheet iron ; other gauges or copper furnishedon special order. Mutins are cored with i^x^ is structuraliron. Sills are filled with… … BOX FR.^ME WINDOW \ m WW- I n - Kit
Building materials
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