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Type name / number: Contex Adding Machine X-55 (electro motor driven)
(please see for the series the text at the X-10)
Production / SN: 493 014 452
Calculating principle: Rocking Segment
Calculating functions: Add, Subtract , automatic multiplycation and automatic division
Input accuracy 10 digits
Calculating accuracy: 11 digits

Automatic multiplication:

Production year: 1968-1970
Case material: Polyurethane
Weight: 4,3 Kg
External links:  
Previous owner: Mr. M.  Sadomskyj , Berlin, Germany
Cosmetic imperfections:
(I accuse no one)
Harddly none
Date of receiving: 2013-03-25
Machine story: 2013-04-02
The previous owner indicated a defect machine. First short investigation shows that the machine fully blocked.

Removed the plastic top and bottom case. Removed a window plate and sprayed the internal calculator mechanism with W40. All vital locations are hidden, so a difficulty arise to have all needed locations.
It was obvious hardened oil what bothers the machine. Turned the motor by hand forward and backwards a little. It seems to me, by the noise, that an mechanism came free by doing so. Pushing the plus key made a complete cycle possible. Put the electricity on and a adding and multiplication was executed. The divisions are still making errors. Further investigation needed.
New photo's on the site of a cleaned and open machine.

The Pinbox transport runs rough / stiff, is lacking behind. And some key's like the 5 is on certain digits an one on the display during calculation input. When the input is done well the division is done well. But strange with a small / neglectible rest. 625 : 25 = 25,0000000089. And the rest is not constand. So a not relaiable calculation / situation.