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Telephone socket from the Simon Akord series, from the manufacturer Contact Simon. The product part number is ATF2/12.
The slightly longer line of the base and spine relative to the sides and clearly rounded corners of the frames distinguish this series from others. Simon Chord is a monoblock, i.e. non-frame series. Economical, but tasteful colors combined with a characteristic oval shape will appeal to customers who expect originality and minimalism from functional details.