| 摘要 |
A simple and rugged alarm which is versatile in application includes a battery connected through first and second parallel switches to a light and buzzer alarm. The first switch comprises a first contact formed in a conductive plate and yieldably biased to an open position and a lever actuated cam for rotatably engaging and moving the first contact to a closed position. The second switch includes a second contact formed in the conductive plate which is yieldably biased to a closed position and a retractable pin for supporting the second contact in an open position.
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