Electromechanical calculating machines from the 1960's
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Rotary calculators
 Badenia VA-17
Badenia VARE-17
Bohn Contex 55
Cellatron R44SM
Diehl DSR-18
Diehl VSR-18
Facit CA1-13
Friden SBT
Friden SVE
Friden SRW
Friden SRQ
Friden RSR
Hamann 505
Madas 20 BTG
Marchant ABL
Marchant SKA DeciMagic
Marchant Tenkeymatic
Monroe IQ-213
Olympia RA-16
Soemtron 214

Printing calculators

Mechanisms

Glossary

Other calculating devices

References and links

Acknowledgements

Wanted

  
Madas 20 BTG        
 
Manufacturer
   H.W. Egli AG
Zürich, Switzerland
 
Mechanism
   stepped drum
 
Capacity
   10 x 10 x 20
 
Years produced
    
 
Price when new
   DM 5560 ($1383) in 1961
 
Size (W x D x H)
   in.
cm..
 
Weight
   lb. oz. (kg)
 
Features
   dual revolutions counters
dual results registers
back transfer
  click on photo to enlarge    
         
An evolution of a machine introduced in the 1930’s. Single keyboard for all number entry. Duplex machine. Back transfer. Superbly crafted, and very expensive. Many variations, which changed the number of registers. There were also many options available, including a device to facilitate extracting square roots (although it did not fully automate). This particular machine was purchased for the Berna bus factory in Switzerland, the factory was purchased by …. (manual, Martin)