Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 470
pip^^Tl Fig. Continued on Sext Page DOOK HANGERS AND lOCKS 399 RELIANCE BAIl-BEARING DOOR HANGER CO. JVidtli of back plate from4 to 6. Requires 3head room above backplate. … Fig. 4. Double Gear. For moving two doors in opposite directions at the same time
Building materials
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