Ventilation compensation structure after elevator is additionally installed in existing house

The ventilation compensation structure comprises an elevator car body, the front end of the elevator car body is movably connected with an elevator protection opening and closing door, and a ventilation mechanism is positioned at the upper end of the elevator car body. According to the ventilation c...

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Hauptverfasser: MA ZHEYU, MA RUIQI
Format: Patent
Sprache:chi ; eng
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