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A comment on Spraying Magnetic Stripe Cards with Iron Filings. Parent comment

Re:Spraying Magnetic Stripe Cards with Iron Filings by bentcorner on Tuesday July 21, 2015 @03:49PM (#9925233)
Reminds me of Esio Trot: https://en.wikipedia.org/wiki/Esio_Trot
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Re:Spraying Magnetic Stripe Cards with Iron Filings by metasean on Tuesday July 21, 2015 @04:39PM (#9925614)
I hadn't heard of Esio Trot, but sounds like a definite fit.

I was actually reminded of "Hidden Messages in Water" - https://duckduckgo.com/?q=%22hidden+messages+in+water%22

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