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for subject
Drilling
containing
形井架
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Chinese
English
井架角形大腿
angle leg
人字
形井架
drilling mast
塔
形井架
pyramid derrick
A字形轻便井架
twin mast
A
形井架
mast
A
形井架
cantilever mast
A形轻便井架
A-mast
普通塔
形井架
conventional derrick
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