发明授权
US3301940A Flexible cable bus duct including grounding means and telescopically engaging tubular members permitting expansion and contraction 失效
柔性电缆总线管道,包括接地装置和可伸缩接合的管状构件,允许膨胀和收缩

Flexible cable bus duct including grounding means and telescopically engaging tubular members permitting expansion and contraction
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