Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 771
Fig. I. STYLE D FILTER Fig. 2. STYLE O FILTER It at once becomes evident that for local service, a large number of very small fil-ters becomes necessary, and, for some demands, they must be very small indeed. Tomeet this demand, filters have been designed of sufficient size to supply water for…
Building materials
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