| 摘要 |
The invention concerns an apparatus (1) comprising a housing (2) containing circuits particularly suited to its function and provided, in its visible top part, with a control keyboard (3) with alphanumeric keys (4), characterised in that the top surface of the keyboard (3) is defined by at least two planes (I and II) on one of which is arranged at least one key (4), such that it cannot be inadvertently pressed, simultaneously with another adjacent key (4).
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