How to read isometric drawings in tamil / Pipe fitter interview questions in tamil

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Teaching Method: 2D , Field, 3D....
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Piping Symbols Downloading Links:
1.https://drive.google.com/open?id=1CtU...
2.https://drive.google.com/open?id=1OBN...
3.https://drive.google.com/open?id=14rv...
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