Aristo was a slide rule manufacturer since 1872. Dennert & Pape was founded by Johann Dennert & Martin Pape, in Hamburg, Germany, and continued under that name until 1936. D&P were the first to laminate and engrave celluloid on boxwood wood slide rules in 1886. Mahogany was used after 1888 and in 1902 started producing slide rules using the System Rietz scales designed by Max Rietz. In 1924 D&P introduced the System Darmstadt slide rule, based on the scales set designed by Prof. Dr. Alwin Walther and began using 'DUPA' as a trademark from 1924 to 1936. All plastic slide rules, using Astrolon for the stock and Plexiglas for the cursor, wereintroduced in 1936 using the trademark 'Aristo'. D&P officially became Aristo as a company in 1948 when they introduced all-plastic Duplex slide rules and discontinued mahogany wood models. Aristo stayed in the slide rule business until the end of 1978, a run of 106 years. Aristo was one of the most important slide rule manufacturers world wide.


REF Dennert And Pape No 1a
Dennert And Pape No 1a - c1880
Made in Germany
Front Scale
A [ B, C ] D


P066 Aristo Rietz 89 (early)
Aristo Rietz 89 Simplex
Made in Germany
Front Scale
13cm // K, A [ B, CI, C ] D, L
Back - Slider
5inch [ S, ST, T]
Multiple hairlines
Original Owner/Location: Hartmut E. Nieman/Germany


P068 Aristo Rietz 89
Aristo Rietz 89 Simplex
Made in Germany
Front Scale
14cm // K, A [ B, CI, C ] D, L
Back - Slider
[ S, ST, T]
Multiple hairlines
Original Owner/Location: Unk/USA


S099 Aristo 99
Aristo 99 Closed Simplex
Made in Germany
Front Scale
11inch // K, A [ B, CI, C ] D, L
Back - Slider
28cm [ S, ST, T]
Multiple hairlines: HP
Original Owner/Location: Unk/Canada


REF Aristo 602 (1972)
Aristo 602 (1972)
Made in Germany
Front Scale
A ( B, -50%/+100%(Mark-Up) )
Back: TBD
Archive - Wenzel Collection


REF Aristo 622 (1970)
Aristo 622 (1970)
Made in Germany
Front Scale
K, D, A,( B, CI )
Back: TBD
Archive - Wenzel Collection


REF Aristo Commerz 623
Aristo Commerz 623
Made in Germany
Front Scale
English-Metric Conversions, A( B, CI, -50%/+100%(Mark-Up) )
Back: TBD
Archive - Wenzel Collection


P196 Aristo 803 Scholar
Aristo 803 Scholar - Date Code GFF3
Made in Germany
Front Scale
L, K, A [ B, CI, C ] D, S, ST, L
Back: Blank
Multiple hairlines: Kw, PS
Original Location: Peru, South America


P205 Aristo 812 Simplex
Aristo 812 Simplex - Date Code G6024
Made in Germany
Front Scale
5in // A [ B, C ] D
Back Scale: [ S, L, T ]


P233 Aristo 814 Elektro
Aristo 814 Elektro - Date Code 515 - c1955
Made in Hamburg, Germany by Dennert & Pape
Front Scale (extended)
13cm // LL2, A (Kw) [ B (Hp), CI, C] D, LL3
Front Well: V, D/M = G/M (3~)
Back Scale: 5in [ Sin, Lg, Tg ]
Multi-lined Cursor
Additional Cursor hairline on slide
Gauge points for resistance of metal wire


P160 Aristo 829 Multi-Rietz
Aristo 829 Multi-Rietz
Made in Germany - Charvoz
Front Scale
13cm, P, A [ B, T, ST, S ] D, DI, 5in
Back Scale:
K, DF [ CF, CIF, CI, C] D, L
Multiple hairlines
Adv: Charvoz
Original Owner/Location: Unk/Netherlands


P158 Aristo 845 Commerz
Aristo 845 Commerz
Made in Germany
Front Scale
13cm // KZ [ T2, P, T1 ] Z, M, Conversion Gauge Marks
Back Slider: [ £, s./d.]
Original Owner/Location: Unk/Netherlands


GFT Aristo 867U Darmstadt
Aristo 867U Darmstadt - dc 1961
Made in Germany - Note transparent linear scales
Front Scale
15cm // K, A [ B, BI, CI, C ] D, P, S, T \\ 6in
Back Slider: [ L, LL1, LL2, LL3]
Multiple hairlines
Back Adv: ASEA (Allmänna Svenska Elektriska Aktiebolaget) - A Swedish company that built 9 nuclear plants in Sweden in 1960's
Donated by Russell Fox, Anchorgae, Alaska. Used by his father who purchased it in Germany 1961-1964. He worked as an Electrical Engineer with BPA in Portland, Oregon. BPA and ASEA had a joint venture in providing electrical energy.


P069 Aristo 868 Studio (Variation 1)
Aristo 868 Studio (Variation 1)
Made in Germany - NIB German Manual
Front Scale
LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale
T, ST, DF [ CF, CIF, CI, C ] D, P, S
Multiple hairlines: PS, KW


REF Aristo 868 Studio
Aristo 868 Studio
Made in Germany 
Front Scale
LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale
ST, T1, T2, DF [ CF, CIF, CI, C ] D, P, S
Multiple hairlines: PS, KW
Archive -Not in Collection


REF Aristo 870 Multilog
Aristo 870 Multilog
Made in Germany - 
Front Scale
LL00, K, A [ B, T, ST, S, C ] D, DI, LL0
Back Scale
LL01, LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2, LL1
Multiple hairlines: HP, KW
Archive -Not in Collection


S203 Aristo 0901 Junior
Aristo 0901 Junior Simplex
Made in Germany
Front Scale
DF [ CF, CIF, CI, C ] D, A, K
Back - Blank
Multiple hairlines: v, d, q
Original Owner/Location: Unk/Germany


S102 Aristo 903LL Scholar (early)
Aristo 903LL Scholar (early) Simplex
Made in Germany - Note different scales
Front Scale
25cm, K, A [ B, CI, C ] D, S, T, L
Back - Slider
[ S, LL2, LL3]
Multiple hairlines
Original Owner/Location: Unk/Germany


S054 Aristo 903LL Scholar
Aristo 903LL Scholar
Made in Germany - Note different scales/end pieces
Front Scale
L, K, A [ B, CI, C ] D, S, ST, L
Back Slider
25cm [ S, LL2, LL3] 8 inch(bi-directional)
Multiple hairlines
Original Owner/Location: K.Korth/Germany


S202 Aristo 903LL Scholar
Aristo 903LL Scholar
Made in Germany - Note different scales/end pieces
Front Scale
L, K, A [ B, CI, C ] D, S, ST, T
Back - Slider
25cm [ S, LL2, LL3] 10 inch
Multiple hairlines: Ps, Kw
Original Owner/Location: Unk/Germany


S546 Aristo 0905 Shut-Commerz (Commerce)
Aristo 0905 Shut-Commerz (Commerce)
Made in Germany - for Charvoz
Front Scale
-%/+%, KZ [ T2, P, T1 ] Z, M, £, s/d
Back Scale: 25cm [ Blank] 10 inch


S055 Aristo 906LL Scholar LL
Aristo 906LL BiScholar LL Duplex
Made in Germany
Front Scale
L, K, A [ B, BI, S, C ] D, LL3, LL2, LL1
Back Scale
ST, T1, T2, DF [ CF, CIF, CI, C] D, P, S
Multiple hairlines
Original Owner/Location: Unk/Germany
 

Looking for: Aristo 907



S252 Aristo 0908 TriLog
Aristo 0908 TriLog
Made in Germany
Front Scale
T1. T2, A [ B, BI, CI, C ] D, P, S , ST
Back Scale
LL1, LL2, LL3, DF [ CF, CIF, CI, C ] D, L, K
Multiple hairlines: PS, KW
Original Owner/Location: Wember/Germany


S351 Aristo 909 MultiTrig (Charvoz)
Aristo 909 MultiTrig (Charvoz)
Made in Germany
Front Scale
P, A [ B, T, ST, S ] D, DI
Back Scale
K, DF [ CF, CIF, CI, C ] D, L
Multiple hairlines: W, HP
Original Owner/Location: Unk/USA


S018 Aristo 0929
Aristo 0929 MultiRietz
Made in Germany
Front Scale
P, A [ B, T, ST, S, C ] D, D1
Back Scale
K, DF [ CF, CIF, CI, C ] D, L
Multiple hairlines: PS
Original Owner/Location: Wember/Germany


REF Aristo 0958 Geodat 400g
Aristo 0958 Geodat 400g c1956
Made in Germany - 24 scales
Front Scale
ctg, T, arc, DF [CF, CIF, CI, C] D, P, S, cos
Back Scale
1-cos, 1-cos, A [ B, 1/tan (a/2), sin cos, cos2 ] D, L, K
Multiple hairlines: PS, KW
Archive -Not in Collection


S204 Aristo 967U Darmstadt
Aristo 967U Darmstadt
Made in Germany
Front Scale
11inch // K, A [ B, BI, CI, C ] D, P, S, T
Back Scale: 28cm [ L, LL1, LL2, LL3]
Multiple hairlines
Original Owner/Location: Kristin Bradbury/France


S103 Aristo 0968 Studio  - V1
Aristo 0968 Studio  (early)
Made in Germany - note: ends and cursor.
Front Scale
LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale
T, ST, DF [ CF, CIF, CI, C ] D, P, S
Multiple hairlines: PS, KW
Original Owner/Location: Wember/Germany


S100 Aristo 0968 Studio  - V2
Aristo 0968 Studio
Made in Germany
Front Scale
LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale
T, ST, DF [ CF, CIF, CI, C ] D, P, S
Multiple hairlines: PS, KW
Original Owner/Location: Wember/Germany


S210 Aristo 0968 Studio  - V3
Aristo 0968 Studio
Made in Germany - Note yellow highlight on slide and scales
Front Scale
LL01, LL02, LL03, A [ B, L, K, C ] D, LL3, LL2, LL1
Back Scale
ST, T1, T2, DF [ CF, CIF, CI, C ] D, P, S
Multiple hairlines: PS, KW
Original Owner/Location: Unk/Germany


REF  Aristo 0969 Studiolog 
Aristo 0969 Studiolog
Made in Germany - 29 scales
Front Scale
LL00, LL01, LL02, LL03, A [ B, BI, K, L, CI, C ] D, LL3, LL2, LL1, LL0
Back Scale
ST, T1, T2, DF [ CF, CIF, S, CI, C ] D, DI, P, S
Multiple hairlines: PS, KW
Archive -Not in Collection


S064 Aristo 0970 MultiLog Charvoz (early)
Aristo 0970 MultiLog Charvoz (early)
Made in Germany - note metal ends and metal cursor
Front Scale
LL00, K, A [ B, T, ST, S, C ] D, DI, LL0
Back Scale
LL01, LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2, LL1
Multiple hairlines: HP, KW
Original Owner/Location: CCJ/USA


S065 Aristo 0970 (Modern)
Aristo 0970 MultiLog Charvoz (Modern)
Made in Germany - note plastic ends and plastic cursor
Front Scale
LL00, K, A [ B, T, ST, S, C ] D, DI, LL0
Back Scale
LL01, LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2, LL1
Multiple hairlines: HP, KW
Archive -This one was SOLD


S106 Aristo 0971 Hyperbolog
Aristo 0971 Hyperbolog 
Made in Germany - note plastic ends and plastic cursor
Front Scale
Th, K, A [ B, T, ST, S, C ] D, DI, Sh2, Sh1
Back Scale
LL01, LL02, LL03, DF [ CF, CIF, L, CI, C ] D, LL3, LL2, LL1
Multiple hairlines: PS, KW

Explanation of Aristo Manufacturing Date Codes
Copyright © 2003-2006 International Slide Rule Museum