| 摘要 |
A speech aid device having a housing and a solenoid disposed in the housing operatively coupled with a sounding head for movement therewith. A magnet assembly is mounted in the housing adjacent to the solenoid and operatively associated therewith. The magnet assembly has first and second pole pieces with a magnet disposed therebetween. A threaded fastener engages the first and second pole pieces and the magnet.
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