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Nol Coopmans ring - handgesmeed Nol ring waarvan onderste helft 14 krt warme kleur geelgoud en bovenste helft is vervaardigd van argentium zilver, model AU/ARG81127.5
Development of a "Nol Ring" test to study polyethylene pipe degradation and its implementation on field house connecti
Development of a "Nol Ring" test to study polyethylene pipe degradation and its implementation on field house connecti
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