update:

better quality:

EN ISO 3819:2015 Laboratory glassware - Beakers (ISO 3819:2015)
EN ISO 4796-1:2016 Laboratory glassware - Bottles - Part 1: Screw-neck bottles (ISO 4796-1:2016)
EN ISO 4797:2015 Laboratory glassware - Boiling flasks with conical ground joints (ISO 4797:2015)


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