Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 670
AIR PUMP … DIAGRAM OF MIXER References—We should be glad to furnish, on request, a pamphlet containing 17 pages of namesof those who are using successfully our machines. Specifications—Architects should insist that specifications and contracts for gas machines shouldstate the number of square feet of…
Building materials
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