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927544-9 Cotterman 4-Step, Steel Tilt and Roll Ladder; 450 lb. Load Capacity, Perforated Step Treads, with Rear Exit, Gray | Imperial Supplies
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Cotterman Rolling Steel Ladder — 450-Lb. Capacity, 13-Step Ladder, 130in.H Platform, Model# 1513R2642A1E20B4C1P3
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Cotterman Rolling Steel Ladder - 20in.L x 24in.W x 70in.H Platform, Model Number 1007R2630A1E20B4C1P6 - - Amazon.com
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Cotterman wood rolling ladder (this and Putnam are major players) | Home library design, Library ladder, Pole barn homes
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Cotterman (Rolling) Ladder - 60in. Max. Height, Model Number 1006R2630A1E10B4C1P6 - Stepladders - Amazon.com
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