Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 643
del B Heater is intended to be used where the waterpressure is less than 10 lbs. to the square inch; or in other words where water is furnishedfrom a tank under a low pressure. Special provision has been made by having a largecentral water way, thus insuring an ample flow of water under low…
Building materials
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