| 摘要 |
Keyboard consisting of a closed box containing a device comprising one or more bulbs with contact blades which are sensitive to a magnetic field, which keyboard is characterised in that the opening of the box 1 is obstructed by a wall 2 with portholes, the solid portion of which consists of a material which does not allow the magnetic field to pass and in that the blades 15-16 of a bulb 14 are arranged beneath each porthole of this wall 2 so as to be capable of actuation under the effect of a magnetic field engendered by a removable magnet 21 presented in front of the said porthole, outside the box. Application for the control of a door with electric latch. <IMAGE>
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