Chang's Musings
Friday, October 31, 2025
Invention of ballpoint pen
https://www.threads.com/@royce231/post/DQbcc_qgEDs?xmt=AQF0SH1ardRDxy29_ultZudi62aMtoGA9iyhs4RCsVY2VQ&slof=1
How does a steel ball control Ink flow ? #fblifestyle
Royce Inyang (@royce231) on Threads
threads.com
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