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Posted to rec.crafts.metalworking
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Hydraulic hand-pump, pressure-gauge and jack / cylinder - buy
On Thu, 24 Dec 2020 18:27:06 -0500, "Jim Wilkins"
Molten glass does this:
https://en.wikipedia.org/wiki/Prince_Rupert%27s_drop
Also known as Czar's Tears.
Joe Gwinn
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