| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission device of a large line capacity capable of increasing workability in extension works. SOLUTION: Under an initial installation unit housing space (110) for housing a unit at initial installation of a transmission device, an extension unit housing part (130) for housing an extension unit when the transmission device is extended is provided. Since the extension work is done at a relatively low position, the extension work is improved in efficiency.
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