DOOR HINGE
A door hinge having a folding structure is provided to use for a folding structure of a soundproof door and a fireproof door, to improve the structure of a hinge by diversifying a door and a doorframe, to heighten soundproof and fireproof effects, and to resist a heavy door, and to have a wide coupl...
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Format: | Patent |
Sprache: | eng |
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