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Pocket Calculators made by Dennert & Pape
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This site is a part of the Online-Museum www.joernluetjens.de
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Pocket Calculators made by Dennert & Pape
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When in the 1970ies the slide rule era was ending, at the same time
the spread of electronic pocket calculators increased rapidly. The famous
slide rule manufacturer Dennert & Pape tried to compete on the market
with a new product line. From 1972 until 1978 they
developed approximately 20 different types of pocket calculators.
Almost simliar to their slide rules for schools the company followed the
same product policy with a range from simple basic calculation to scientific
applications.
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Two competing
concepts:
mini-calculator
or slide rule?
The small but continuously growing
group of pocket calculators was coexisting then with the still produced slide rules and had to gain parts on the market. In advertisements this doubling was used for argumentation ("With ARISTO so or so") |
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The new slim design had the dimensions 62x151x18 mm. The calculators
were quite slim at that time, because they fit into a jacket-pocket. They
needed 3 AA-cells of 1.5V and the total weight was approx. 195 grams. Optionally
run on main-power-supply and accumulators were possible. The display of
the first generation was made by red LED’s, composed by blocks of 3. Every
ARISTO electronic calculator had a smoky-transparent plastic cover, protecting
the unit and being placed on the calculator bottom during use. Additionally
a black case made of nappa-leather could be supplied.
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| The new design was an eye-catcher, making it a real great success for ARISTO. Beside of the clear form and color-design the nice feeling of the keyboard was remarked. On this example one could see realized a successful syntheses of form and function – one of the most important basic rules of a modern industrial design. This design applied a standard to the development of more types of calculator shortly after. With the same appearance, form and size followed in the years 1974 and 1975 the models M 75, M 36, M 65 and M 80. On the Hannover-Fairs the design won several times the award “Excellent Industrial Form”. |  |
Here is shown the full spectrum of ARISTO electronic calculators. All items belong to my collection. The only exception is the picture from the demonstration calculators (these both items belong to the successor company of ARISTO). But take in mind that some models are issued in different, improved versions.
Click on the index fotos and
you'll see
magnified images with some additional
technical datas.
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produced electronic pocket calculator: M 27
market introduction in fall 1972, |
These 6 calculators belong to the first generation of in-house developments.
The displayed calculators are here put in the order to their code numbers
but this doesn't correspond to their date of issue.
M 64 was the first by ARISTO entirely developed calculator.
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(2 versions) |
(2 versions) |
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M 75 ES |
M 80 S |
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The second generation of calculators with enlarged keyboard:
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M 42 S |
M 66 S |
M 76 S |
M 85 S |
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in a transportation suite-case with charger unit. |
measures: 74 x 37 x 4,5 cm, LED21 mm height. |
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M 76 S / M 85 S / unilog |
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The third generation as cheap calculators:
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top S |
parat S |
unilog S |
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Die fourth generation: flat calculators with buttontype batteries and liquid crystal display (made in Japan)
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And at the end ARISTO come on the market with an unusual calculator: a desk-top variant.
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© Prof. Dr. Jörn Lütjens, April 2010
