| 摘要 |
An openable architectural structure or fitting, such as a window or door assembly, having a stationary framework of a non-magnetic material with an aperture and a movable member adapted to close the aperture at one position thereof and to open the same at another position thereof. An approach detecting means, such as a reed type switch means, a limit switch means, an impedance bridge means, etc., is concealed within the stationary framework, so as to actuate a suitably mounted alarm means when the movable member is moved to the other position without authorization.
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