Abstract: An edge mask for a printed circuit board comprises a T-sectioned strip 1, to the base web of which can be secured a printed circuit board, via lugs and screws. The strip 1 carries a handle 3 at each end pivoted on a respective shaft 13 having side walls which pass through a slot 8 and cut-away 7 and end in hooks 14 which engage a subframe member 11 of apparatus in which the board is assembled. The handles can occupy alternative retaining and pulling out positions, and are biased by respective springs 15 into the retaining position. Contact strips 10 are also provided for effecting an earth connection to the apparatus frame.

Abstract: A modular public telephone has two independent armored boxes, one of which contains the telephone mechanism and the other of which is a strong coin receiving box. Both boxes are provided with front doors, and the upper box has a number of windows for receiving the respective operating modules including a coin insertion module a credit card insertion module, a display module, a keyboard module, a coin return module and a handset receiving module. A number of the modules can be interchanged or substituted.