Re: Vintage Diagram Drawing Techniques?
And it is a nightmare if you forget to clean them well after work. If ink dries in the Rotring drawing channel, the tiny wire inside will "freeze" and the whole pen is headed towards the bin.
My granddad used to have lots of these (working on architect's tasks) and even after the usual discussions with customers some pens (mostly the .25) had become sticky and he would start blaming the inventors ...
Regards, Joe
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