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Steelbinder Steel Strap Calculator
Object type: slide rule
Maker: A. J. Gerrard & Co
Materials: paper; metal
Measurements: .25" h x 6.5" dia
Slide chart with red and grey cutaway disk over white disk; calculate strap size against length in feet; total weight against number of pieces. On reverse: recommeded types of strapping for various conditions (atmosphere, fumes, water, soil).