| 摘要 |
A switching element of a sheet of resilient metal having high and low heat-expansive sides, the switching element having a middle leg carrying an electric contact for making and breaking a circuit with a stationary contact on a substrate below, first and second outer legs each having one end connected to the same end of the middle leg, and an arm of width smaller than 1/3 of the width of said switching arm extended outwards from the connecting area between the middle leg and the outer legs in longitudinal alignment with the middle leg for pulling upwards/pushing downwards by an external force to reverse the middle leg.
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