| 摘要 |
In known manner, a pipe system comprises a group of tubes and couplings connecting a suction station to one or more suction openings, the tubes and couplings being equipped with low voltage electric conductors for transmitting an electric stop or start signal from the station. According to the invention, the conductors equipping the tubes are in the form of strips integral with the tubes. Such strips can also equip the couplings.
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