London Computator 912/S

Anita Hand-held Calculators
Anita 811 & Adler 81


Anita 811

Anita 811 / Adler 81 (Type EC11)

Display is 8 digits, red LED.

4 functions, %, memory.

4.5v (3x AA batteries).

69 mm x 118 mm x 24 mm (2.8" x 4.7" x 1").

Anita 811 label -
Sumlock Comptometer Ltd,
Uxbridge, Middlesex.
Made in England.

Adler 81 label - (Some were also labelled 'Triumph')
TA Vertriebs - GmbH,
85008500 Nurnberg (Germany).
Made in England.

Introduced 1972, price £75 [about $175].

The switch position "5/4" on the Adler is the same as that marked with a semi-circle on the Anita, and indicates that the answer will be rounded to 2 decimal places.

There is an operating manual for this machine in the Operating Manuals & Leaflets section.

This was the first Anita hand-held calculator put on sale. The story of the development of the Anita 811 and the version for Triumph-Adler is described in "The Rockwell Connection" on this site.

   ADLER 81

The Adler 81 model was made in two versions with the name in different places, as shown below.

Adler 81
Adler 81
With rear cover raised

The picture on the left demonstrates that the rear aluminium cover slides up to replace the batteries, which is common to all models of this series.

Note that the model illustrated here is a variety with a white painted rear cover.


Advertisement for the Anita 811.

Note the Anita logo in the centre which was in use around this time.

Origins of Bell Punch Co.
Mechanical Calculator Days
National Calculating Service
Development of Anita 1
Development of Anita 2
Anita is Launched
At work with Anita
All Change at Bell Punch
Anita Developed Further
Anita at its Zenith
The Rockwell Connection
Demise of Anita & Bell Punch
Mechanical Calculators
Early Anita Desktop Calculators
Transistors & Integrated Circuits
Anita LSI Desk Calculators
Anita Hand-held Calculators
Rockwell-Anita Calculators
Calculators made by others
Advertisements & Brochures
Operating Manuals & Materials
Company Information
The Technology Explained
Operating a Comptometer
Old Sterling Currency, £sd
Update Information
Getting in touch

Anita Hand-held Calculators

Anita 811 & Adler 81

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Text & photographs copyright © 2002, 2003, 2004 Nigel Tout, except where noted otherwise.