| 摘要 |
The sensor has a casing (10) defining an elliptical retainer (11) and a circular retainer or a sector-pattern retainer connected to it. The sensor also has a ceramic signal buzzer (20), several insulators (21-23) on the top side of the buzzer and a C-ring (14) securing the insulators in the retainer and connected to a cathode wire in the ceramic buzzer.
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