Manufacturer: Aristo
Country of Manufacture: Germany
Type: 971 Hyperbolog (Charvoz)
Number: 581
Date of Manufacture: 1958
Scales: (Front) Th, K, A [B, T, ST, S, C] D, DI, Sh2, Sh1
Scales: (Back) LL01,LL02, LL03, DF [CF, CIF, L, CI, C] D, LL3, LL2, LL1
Number of Scales: 25
Gauge Points: π, s, s', R, e
Slide Rule made from: Plastic
Cursor made from: Plastic
Cursor Lines: 2 on front, 4 on back
Overall Length of Rule: 33.8 cm
Length of Scales: 25 cm + 3cm extension
Width: 4.7 cm
Depth: 0.4 cm
Weight: 105 gm
Acquired from: Toll House Antiques
Date: July 2000
Condition: Good
 Brown leather case.  Good condition
 Very high gloss finish