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Pinhole shots of the Civil War (re-enactments)
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January 29th 13, 11:29 PM posted to rec.photo.digital.slr-systems,alt.photography,rec.photo.digital
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Pinhole shots of the Civil War (re-enactments)
On Tue, 29 Jan 2013 16:21:52 -0600, Doug McDonald
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2) spark erosion drilling
AKA EDM or Electric Discharge Machining,
http://en.wikipedia.org/wiki/Electri...arge_machining
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