Elevator voice inter-speaking system
The utility model discloses an elevator voice talkback. A pickup in the elevator is connected with a loudspeaker in a monitoring center through a transmission line to form a first voice transmission circuit and the pickup in the monitoring center is connected with the loudspeaker in the elevator thr...
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Main Authors | , , , , , , , |
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Format | Patent |
Language | Chinese English |
Published |
17.09.2008
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Subjects | |
Online Access | Get full text |
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