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Kontrol-Motor Valve Capacity Calculator
Object type: slide rule
Maker: Kieley & Mueller Inc.
Place made: Middletown, NY
Date made: 1947
Materials: paper, metal, plastic
Measurements: .25" h x 8.25" dia
Yellowed paper chart has pressure drop, downstream pressure, specific gravity on top disk, types of valves and valve sizes on bottom disk, steam factors on clear plastic cursor. Instructions and tables on reverse.