Typical Colors of pens/pencels use in changes in drawing

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Typical Colors of pens/pencels use in changes in drawing Head of Engineer and Designer Purple pencil or pen, Drafting and Engineering Green pencil or pen, Machine shop Red pencil or pen, Weld shop Silver pencil, Clients Blue pen or standard pencil, Standard Pencil lead by any one Strike though not use or change, Under line important dimension to hold, Circle shows change for press or running fit,Highlighter use by any one Yellow onlyOnly the wording has bend change from the book due to copyrights The book is still being written is not publish at this time on machine work .David Smith Clovis CA May 25 ,2015HF 170 welderHF 4x6 band sawSouth Bend 9NMillB&D mag drillVictor torch