Inside Out Library
Building and Engineering Catalog 1921 Edition (1921)
Specification Data, Limited · Specification Data, Limited · leaf 203
Swinging Firs Door Fixturi Type No. 500. Flat Track Fire Door Fixtik: Carries Underwriters Label.Building and engineering specifications · Construction companies · Building material manufacturers
Internet Archive · Building Technology Heritage Library · Public Domain Mark 1.0. Free to use for anything.
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