Data Chart Corporation, ADEL Diivision, De Laval Turbine, Conversion Factors & Circular Slide Rule

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Country of manufacture: USA (Inferior knock-offs of similar Concise products),            Date of manufacture: ____
Overall Height: 7.5 cm,          Width: 10.8 cm
Materials: All plastic
Scales: 6
Front: D [ C, CI, L, A, K ]
Gauge Marks: [ π, C, 1/M (2303), 2π, R (573), 786 ]
Condition: C3-C4 (Very Minimal to Minimal signs of use)
Came with: white plastic case

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