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A comment on The Painstaking, Secretive Process of Designing New Money. Parent comment

Re:The Painstaking, Secretive Process of Designing New Money by xioxox on Sunday September 11, 2016 @02:49AM (#12472311)
Unlike in the US, in many countries notes are not valid for all time. After an expiry date they must be exchanged at a bank for a new note.
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