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| Start / | Knowledge / | Issue Kinds / |
| Changes | Differences | Fakes | Issue Occasions | Kinds | Parallel Issues | Quality |
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Knowledge / Issue Kinds / Coils / Issue Occasions |
Coil issue occasion: summary of the different coil issue occasion reasons |
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Proof coil: compilation in the form of a postage stamp coil with which the function of a vending machine was tested |
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