A vintage Minneapolis Honeywell Valve Size Computer. The slide chart is circa 1953 by the Minneapolis-Honeywell Regulator Company. Produced by the Perrgraf Company, Maywood, Ill. The slide chart was used for valve sizing for liquid, gas, and steam. The piece is in very good condition and includes a brown plastic sleeve. The slide chart measures approximately 8 1/2" long x 2 1/8".
