| 摘要 |
Sound communication system and remote strike control, termed entrance intercom for villa. Operating on just two wires, including the electric strike. The present method offers the following possibilities in regard to the two wires installed; -Electronic ringing call. -Answer and conversation. -Automatic return to inactive (at the end of conversation). -Opening of the door (by strike control). -Lighting (or not) on the street plate. <IMAGE>
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