Invention Grant
US07692542B2 Door position monitor 有权
门位置监视器

Door position monitor
Abstract:
A door position monitoring mechanism mounted in the edge of a door that senses whether a door is opened or closed by sensing the absence or presence of a magnetic field of a magnet that is mounted in the door frame. Information regarding the door position is then transmitted to a battery operated wireless access control system mounted on the same door through wires extending from the door position monitoring mechanism.
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