KIT calculator MINI 73

Date of introduction:  1973 Display technology:  LED-modules
New price:   Display size:  8
Size:  5.1" x 3.0" x 1.3"    
Weight:  5 ounces Serial No:  
Batteries:  5*AA Date of manufacture:  year 1973
AC-Adapter:   Origin of manufacture:  Switzerland
Precision:  8 Integrated circuits:  TMS0105
Program steps:   Courtesy of:  Peter Muckermann († April 21, 2021)

This KIT calculator MINI 73 was sold June, 1976 by the Switzerland company Ellenberger Electronic AG. The price tag gave a whooping SFr 396.50, about US$ 200.

The manual of the kit stated "don't compare it with the cheap calculators manufactured in Japan" and used a very rigid construction based around the "calculator-on-a-chip" TMS0105.

The calculator housing is known from the German MBO Junior.

According to fellow collector Frank Boehm this calculator was manufactured by DITTEL.

If you have additions to the above article please email:

Joerg Woerner, December 5, 2001. No reprints without written permission.