Graphoplex 690a Neperlog Duplex

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Country of manufacture: France,            Date of manufacture: ____
Overall length: 33.6 cm,          Width: 4.9 cm,           Weight: 119.2 gms
Materials: :Plastic (PVC) stators and slide, plastic end braces glued onto front and back of rule, rubber bumpers both sides
Cursor: 3.9 X 5.7 X 1.1 cms; all plastic, slightly magnifying; lines = five on front, three on back
Scales: 26, extensions on A, B, C, D
Front: LL01, LL02, LL03, DF [ CF, CIF, K, CI, C] D, LL3, LL2, LL1
Back: LL00, L, T>45°, A [ B, T<45°, SRT, S, C ] D, P, DI, LL0
Gauge Marks: [π, e, S, ρ (5730) ]
Condition: C5 (minimal signs of normal use but no spring in cursor)
Came with: Original dark red plastic case

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