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Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 770
1800- 3600 T 125- 275 2400- 5000 5 150- 325 3000- 7500 250- 425 6000- 10000 I 350- 600 8000- 14000 i^ . 500- goo 12000- 20000 iJ 700- 1400 16000- 32000 i^ 950- 1900 22000- 40000 2 1200- 2400 28000- 56000 2 1900- 3800 45000- 90000 2A 2800- 5600 70000-13 5000 3 3800- 7600 90000-180000 4 5000-10000… … Fig. 7. NATIONAL DUPLEX FILTEREquipped with Single Controlling Valve ROBERTS MANUFACTURING CO. 700 FILTERS MAIN OFFICE AND WORKS PHILADELPHIA, PA.Cor. 30th and Chestnut Streets PRODUCTS. ROBERTS MANUFACTURING CO. Manufacturers of Filters Flatiron Building, Twenty-third Street and Fifth AvenueNEW…Building materials
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