| 摘要 |
The apparatus frame receives plug-in electronic modules (1) provided with a front plate (2) secured to upper and lower front rails (3,4) provided with threaded bores (6) in defined positions, for receiving fixings for the front plate. An intermediate element is fitted to the front rails and has at least one projection 10) in a defined position, for preventing full insertion of an incorrect plug-in module, which does not have a corresponding locating recess (11) at the rear of its front plate
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