The ADDIATOR came in a LEATHER NOTEBOOK with a handy STYLUS/PENCIL.
To use the SUBTRACTION side, the ADDIATOR is to flip down.

ADDIATOR, Berlin / Germany   (1955)

B o d y   S i z e    ( W * D * H )    =   78 mm * 123 mm * 5 mm

     Have a look at a NEWER VERSION ...

R E M A R K :  Overflow/Underflow = RED MARKS with ARROWS 

impressum:
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© C.HAMANN       http://public.BHT-Berlin.de/hamann        09/10/11