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Wangtang1
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http://img268.imageshack.us/img268/9...ingdrawing.jpg
How can I tell whether this is third or first angle projection? What is the big line at the top that the red arrow is pointing at? Is an external thread used where the orange arrow is pointing at?
How can I tell whether this is third or first angle projection? What is the big line at the top that the red arrow is pointing at? Is an external thread used where the orange arrow is pointing at?
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