Baroid Division NL Industries, Model NL-1, Insert NL, Circular Slide Rule & Reference Tables

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Country of manufacture: Japan,            Date of manufacture: ____
Overall Height: 11.0 cm,          Width: 7.5 cm
Materials: All plastic
Scales: 8,
Front: D, C, CI, L, A, S, T, K
Gauge Marks: [ π, 2π, R, 1/M, C, A ]
Condition: C3-4 (Very Minimal to Minimal signs of use)
Came with: black plastic case and instructions

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