| 摘要 |
An electromagnet is formed by an arrangement consisting of an iron supporting part, an iron piece and a solenoid coil as well as an interrupter, in order to energise the electromagnet intermittently. A cylindrical membrane, which is provided with a base, on which an armature core is mounted such that it can strike against the iron piece, covers the iron supporting part such that the iron piece, the solenoid coil and the interrupter are enclosed.
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