Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 467
andquickly, but it cannot pinch or slam against anyone passing through. Possessing these qualities, quick action, slight resistance to pressure, simplicity inuse and economy in working space, the Balance Door is invaluable for the handling oflarge crowds where an absolutely wind-proof door is… … WJBTB QFl}oonj&iy W ^. Fig. 2
Building materials
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