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ACTIVITIES OF INVOLVEMENT AND OPERATIONAL CONTACT IN A CROSS-BORDER
ACTIVITIES OF INVOLVEMENT AND OPERATIONAL CONTACT IN A CROSS-BORDER
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机译:跨境参与和操作联系
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摘要
A screw head is provided with projections on selected of the driver-engageable surfaces of the head to interlock with surfaces and edges of the driver to reduce the tendency for the driver to slip out of engagement with the screw during driving and also to provide a temporary stick-fit between the driver and the screw.
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