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

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Other calculating devices

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Monroe IQ-213        
 
Manufacturer
   Monroe International Corp.
Orange, New Jersey, USA
 
Mechanism
   stepped drum
 
Capacity
   10 x 11 x 21
 
Years produced
    
 
Price when new
   $1085 in 1964, $995 in 1967
 
Size (W x D x H)
   in.
cm.
 
Weight
   lb. oz. (kg)
 
Features
   visible memory register
back transfer
dual revolutions registers
  click on photo to enlarge    
         
This machine is the culmination of over fifty years of Monroe rotary calculator production. Back transfer, a particularly flexible and visible memory register. The keys are large, and explicitly labeled without use of cryptic abbreviations. As a result, it is fairly intuitive to use despite its many extra features. Significantly larger than the standard Monroe rotary calculators, it uses the same biquinary stepped drum mechanism. From Los Alamos.