Parts of the text is extracted from the John Wolff web site.
Content without guarantee! (UK); Inhalt Ohne Gewähr! (DL)

Type name / number: Contex Adding Machine X-30 (electro motor driven)
(please see for the series the text at the X-10)
Production / SN: 473 126 695
Calculating principle: Rocking Segment
Calculating functions: Add, Subtract , automatic multiply and semi automatic divide
Input accuracy 10 digits
Calculating accuracy: 11 digits

Automatic multiplication:
Once the first number (the multiplicand) has been entered, the operator presses the "X" key to change the keypad into cycle-counting mode. When the first (ie, least significant) digit of the multiplier is pressed, the machine will perform the required number of addition cycles and shift the pin carriage one place to the left. The process is repeated as subsequent digits are entered. The keypad returns to its normal function when the machine is cleared.

Production year: from 1965 onwards. 14-08-73 is scratched in the bottom plate
Case material: Polyurethane
Weight: 3,2Kg
External links:  
Previous owner: Mr. N. Baaijens, Lochem, The Netherlands
Cosmetic imperfections:
(I accuse no one)
Harddly none
Date of receiving: 2012-10-08
Machine story: 2012-10-11
Fully functional on arrival. Cleaned and photo's made.