Abstract: There is provided an engaging mechanism of a system in which the flange-like protrusion at the portable equipment is engaged with or locked to an engaging part at a belt clip, wherein both fitting and removing for the portable equipment are simplified. The system such that the flange 5 at the portable equipment 1 is constituted by the disc 6 and the annular frame 7, the protrusion 8 directed inwardly from the annular frame 7 with its circumferential sides being applied as slant surfaces 8b and 8c; the engaging plate 23 of the belt clip 21 (refer to FIG.

Abstract: In an operating component placement system for electronic equipment, assembly units (5) having cables (8) whereby operating components (6a to 6e) are connected to connectors (7a to 7e) are used to mount the operating components (6a to 6e) to a front panel (4), with connectors (7a to 7e) connected to connectors (3a to 3e) on a panel board (3) for signal input for various functions, and the cable lengths for operating component groups (6a to 6c) and (6d and 6e) having the same form established so as to be longer than the maximum distance between the connectors (3a to 3c) and (3d and 3e) to which each operating component group is to be connected on the panel board 3 and hole groups (4a to 4c) and (4d and 4e) for mounting each of the operating component groups to the front panel. Operating components having the same form can be selectively laid out by changing the cable positioning.