Boots Ringplan Precision Log Log Slide Rule

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Country of manufacture: Japan,            Date of manufacture: ____
Overall length: 29.4 cm,          Width: 4.9 cm,           Weight: 100.9 gms
Materials: All plastic
Cursor: 3.6 X 4.8 X 0.7 cms; all plastic, slightly magnifying; lines = one hairline on front
Scales: 17, no extensions
Front: 25 cm // LL₃, LL₂, LL₁, A [ B, BI, CI, C ] D, DI, K, LL₀
Slide Back: T₂, T₁, L, S
Back: blank
Gauge Marks: [π e, C (1128), ρ'' (2063), ρ' (3438), ρ⁰ (5730) ]
Condition: C4-C5 (Minimal to Normal Signs of Use)
Came with: Original black and transparent plastic sheath

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