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T.I.R note in drawings

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jimp178

jimp178

Mechanical
Joined
Apr 23, 2001
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Dumb question I know but I have this old drawing sent to me with a note diameter to be concentric to within 0.127mm T.I.R. Datum A. For the life of me I cannot remember what T.I.R. stands for. Thanks in advance JimP178
 
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