Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 675
h we invite investigation. We have devoted the utmost attention and scientific skill to embodying the primerequisites and every possible improvement in our Omega, and guarantee our gen-erator to be: First—Absolutely safe; this result being obtained by means of devices that are so arranged that an…
Building materials
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