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In Reply to: Up until the 1990's we used ultrasonic celaning for.... posted by HiFiOd on May 20, 2015 at 12:13:02:
Probably much thinner than 1 mm. was the center pin of a rapidograph's tip. Actualy it was so thin that it couldn't stay straight when it was out of the channel surrounding it. The space in between got filled with ink and the pin could slide inside the channel as the ink made its way to the bottom.
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- RE: Up until the 1990's we used ultrasonic celaning for.... - Alanpiga 16:47:10 05/20/15 (0)