发明授权
US4389123A Electronic alarm watch 失效
电子报警表

Electronic alarm watch
摘要:
A waterproof construction around a miniature buzzer incorporated in an electronic alarm watch depends on a gasket alone. The construction is such that the gasket can secure a resonant plate without any storage of distortion in the resonant plate. This feature makes it possible to provide the electronic alarm watch having a stable performance for acoustic emission.
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