| 摘要 |
The tennis courts are managed by raising or lowering the net. The net post (1) contains and electric actuator (2) acting on the central of three pulleys(11-13). A steel wire (9) fixed to the post and to the top of the net, is displaced by the action of the actuator on the central pulley to lower or raise the net. The actuator is controlled by a computer responding to a smart card reader.
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