Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 469
products can be shipped within aweek. Single Door Open, hasthree grooved solidsteel tracks, steel ballseach side of centretrack. No Wheels. No Noise. Width of back plate from3J to 6i, according toweight of door. Walking-beam for movingtwo doors in oppositedirections at the sametime. IJidth of back… … Fio. I
Building materials
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