If two or more movables belonging to different owners are so united together that they can no longer be separated without severe damage, or cannot be separated without excessive expense, the ownership of the composite thing belongs to the owner of the principal movable. If no distinction of principal and accessory can be made, the owners of such movables shall own the composite thing jointly in proportion to the value of the movables at the time they were united together.
Civil Act — Article 257 (Attachment between movables)
민법 제257조
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