Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 357
Fig. 3. MASON SAFETY TREADS Fic. 4. MASON SAFETY TREADS ON IRON STAIRS ON CEMENT STEPS Screw Holes Drilled and Countersunk at the Factory Anchors Furnished for Installing These are made upon the same protective principle, having lead strips imbeddedbetween rows of lenses, and all borders fully…
Building materials
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
