The Salice system for Concertina Doors has been designed to open both doors on one side only, giving good access to the interior of the cabinet. Space taken up by the door in the maximum open posistion is reduced to a minimum (approx. 80mm).
The PDF information can be found here.
Salice Sliding Door Block/Guide - F1PXAY
Salice Sliding Door Centre Hinge - F1CXE9
Salice Sliding Door Hinge - F1C169
Salice Sliding Door Track - F1GFA Series - 1180mm long