San Francisco : Architect and Engineer, Inc · leaf 143
tomatic steel rolling shutters. The latternormally stay open or shut at will without disturbing the automaticfeature. The old type of sliding door which stayed closed kept the shaftdark, foul and poorly ventilated, was noisy in operation and continuallyout of order. One other type of factory… … ALL METAL AUTOMATICALLY CLOSING FIRE DOOR
Architecture · Building
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