Simple-supporting base screwing and anchoring type comb plate expansion and contraction device
The utility model discloses a simple-supporting base screwing and anchoring type comb plate expansion and contraction device. The expansion and contraction device comprises a fixed comb plate, a movable comb plate and water stop belts and is characterized in that the fixed comb plate and the movable...
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Format: | Patent |
Sprache: | eng |
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