Engineering Instruments 77A American Log Log

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Country of manufacture: USA (OEM by AcuMath?),            Date of manufacture: ____
Overall length: 31.8 cm,          Width: 4.2 cm,           Weight: 75.4 gms.
Materials: All plastic; glued-on plastic end braces
Cursor: 2.7 X 5.9 X 0.8 cms; all plastic, adjustable; lines = single hairline, front & back
Scales: 20, no extensions
Front: LL02, LL03, DF [ CF, CIF, CI, C ] D, LL3, LL2
Back: LL01, K, A [ B, T, ST, S ] D, L, LL1
Gauge Marks: [π, e, ', '' ]
Condition: C4 (Minimal signs of use)
Came with: Original dark blue leather slipcase

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