Calculating - Addmaster
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Addmaster Junior
 
Model    
Maker   Addmaster
Origin   West Germany
Date   1960s
Serial    
 
A pocket calculator operated by sliding bands up and down with a stylus.
 
Adding is performed on one side and subtraction on the other, flipping between the two as needed. If the number is silver, the band is slid down to the bottom. If red, it is slid up to the top and round to the left and down to carry over to the next column to the left.
 
The stylus has a propelling pencil on the other end and the holder includes a notepad.
 
The similarity to the larger Addiator is no coincidence. The designer of the Addmaster was the son of the founder of Addiator.
 
The Addmaster company was also known as Admult.
 
 
 
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