Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 314
Fig. 7. DETAIL SHOWING GUIDEWHEEL AND SHOE IN PLACE Fig. 8. PATENT HOIST APPARATUSWhich materially assists counterweight devicein holding door constant, and facilitates ease ofoperation. SINGLE CHAIN WHEELSUsually furnished forchain to off-side wheeland shoe. Where thiswheel cannot be used,…
Building materials
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