The invention is essentially applied to the telescope tubes with the length adjustable, such as the dust suction tube of a vacuum cleaner.
本发明主要用在吸尘 器中的吸尘管等各种长度可调节的伸缩管上。
The invention is essentially applied to the telescope tubes with the length adjustable, such as the dust suction tube of a vacuum cleaner.
本发明主要用在吸尘 器中的吸尘管等各种长度可调节的伸缩管上。
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