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Added a german reference for product codes
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* https://en.wikipedia.org/wiki/Resin_identification_code
 
* https://en.wikipedia.org/wiki/Resin_identification_code
 
* https://en.wikipedia.org/wiki/Recycling_codes
 
* https://en.wikipedia.org/wiki/Recycling_codes
 +
* https://de.wikipedia.org/wiki/Produktkennzeichnung
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