09-26-2017
09:06 AM
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09-26-2017
09:06 AM
Hi @AIR_123,
I believe that they are a reflection of technical pens that used to be used for drafting by hand. Any old dog like myself used to have at least one set of pens that ranged from 000 to 4 mm. (They are still sold today but I can't imagine there is much market for them)
When pen plotters came on the scene, the pen sizes were based upon these technical manual ones because one frequently added manually to the plotted drawings.
John Vellek
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