Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 293
STiLE I FULL PANEL DOOR St^le zTWO-PANEL DOOR Styxe 3PANEL DOORBeveled Effect Stvt p a TWO-PANEL DOOR Beveled Effect … Fic. 9. SECTIONAL VIEW OF THE DAHLSTROM FIREPROOF DOORShowing sheet steel frame, casing, and one method of securing same to the wall
Building materials
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