Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 230
Fig. Fig. 3. KEYSTONE HAIR INSULATOR ■KEYSTONE AS APPLIED TO WALLCONSTRUCTION ELECTRICAL SUPPLIESNoark Fuse Devices; Electric Cable Conduit. This company is the largest concern in the world manufacturing Asbestosand Magnesia products and its line of materials embraces a greater variety than…
Building materials
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