handhole cover ; access plate
... 观察孔舷门 porthole 观察孔盖 access plate ; handhole cover 护目镜、观察孔 Visor ...
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圆柱齿轮减速器箱盖的机械加工工艺过程设计及铣削观察孔端面的专用夹具设计;
Cylindrical gears reduction gear box lid's machine-finishing process engineering and milling port hole end surface's unit clamp design;
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