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Series No. 20 Double Groove Type
A highly efficient type for the better class work.
Features: this equipment gives double contact at sash cord borings and on pulley stiles. The pulley stile strips are attached with screws, permitting easy removal. After sash are squared, variation in alignment is corrected by packing out the No. 11 type strip with waterproofing Ruberoid strips making the pulley stile members parallel. |