Back ridge supporting workpiece
The utility model relates to the technical field, in particular to a back ridge supporting workpiece which comprises an abutting assembly and a fastener, and the fastener is in threaded connection with the abutting assembly. The double-pipe back ridge overcomes the defect that in the prior art, the...
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Hauptverfasser: | , , , , , |
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Format: | Patent |
Sprache: | chi ; eng |
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