Abstract: A coding device includes a contact carrier (3) and a coding disk (4) that can be set in a plurality of rotary positions relative to the contact carrier (3) to set corresponding codes. Moreover, the coding disk (4) is displaceable between an inactive position, in which it is spaced apart from the contact carrier (3) and no code is effective, and an active position, in which a code corresponding to the rotary position of the coding disk (4) is set on the contact carrier (3). Because a desired code can be selected by rotating the coding disk (4) to the corresponding rotary position while the coding disk is in its inactive position, the code selection can be effected in a potential-free manner.

Abstract: A keyboard has keys arranged in parallel columns with all of the keys in a respective column projecting from a front plate the same distance. The keys of a first column are arranged to project a smaller distance from the front plate than the keys of an adjacent second column.

Abstract: A multi-pole plug-in connector, particularly for the connection of printed circuit boards with cables, has a connector including an insulating strip (1) and a plurality of juxtaposedly fixed contact pins (3) arranged in mutually parallel planes (2). A female connector can be plugged onto the plug-in arms (4) projecting from the one side of the insulating strip (1). The printed circuit board arms (6', 6") projecting from the other side of the insulating strip (1) extend in at least two different directions so that the plug-in connector can be simultaneously connected with at least two printed circuit boards.