bolts and nuts metal plates steel structure heavy duty straight crossbar frame bridge support |
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| navigate by keyword : beam girder strength anchoring screws bolts connection nuts plates welding metal assembling equipment engineering heavy fastener concept bolt bridge detail support crossbeam frame steel strong rod structural screw construction row crossbar architecture metalwork calculating structure architectural column straight framework material duty prefabricated connecting base pillar truss perspective lines arch |
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| Bolts and nuts on metal plates of steel structure of heavy duty straight crossbar of frame and bridge support. |
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