woodruff key 半圆键 ; 半圆钻 ; 半月锁
woodruff key seat cutter 半圆键槽铣刀
Woodruff key seat 半圆键座
Woodruff key-seat milling cutters 半圆键槽铣刀
key woodruff 半圆键
woodruff f key seat cutter 半圆键槽铣刀
N a semicircular key restrained in a curved keyway in a shaft 半月键; 半月销 [engineering]
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