Berger Scientific Instruments, Inc. C2138M (same as Weber 04293, Charvoz-Roos Trig-o-Log SR-111)

---

Country of manufacture: USA,            Date of manufacture: ____
Overall length: 31.3 cm,          Width: 4.2 cm,           Weight: 94.4 gms
Materials: Celluloid laminate over wood, metal end braces, adjustable
Cursor: 2.7 X 5.9 X 1.1 cms; all plastic, adjustable; lines = single line, front and back
Scales: 21, no extensions; printed on, not engraved
Front: L, LL1, DF [ CF, CIF, CI, C ] D, LL3, LL2
Back: LL0, LL00, A [B, K, CI, C] D, S, ST, T
Gauge Marks: [ π, e, π/4 ]
Condition: C4 (minimal signs of use)
Came with: nothing

---

---