Invention Needed: Bubble Pen 12 07 2016
A common disposable type of pen whereby on the end opposite the writing end is a simple air valve bubble that can be depressed once or more to pressurize the ink in the pen and make it flow immediately.
© 2016 Thomas Paul Murphy
A common disposable type of pen whereby on the end opposite the writing end is a simple air valve bubble that can be depressed once or more to pressurize the ink in the pen and make it flow immediately.
© 2016 Thomas Paul Murphy
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