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Author Topic: How does scratching a coin make it work in a machine?  (Read 2206 times)

purplerain

  • Guest
Tahnee asked the Naked Scientists:
   
Why do the pay on foot machines have a scratch-area so that the coins that wont work, work after scratching them?

What do you think?
« Last Edit: 04/04/2011 17:30:02 by _system »


 

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