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Код виджета <div class="calculator6-widget" data-source="https://www.calculator6.com/ru/email-marketing-roi-calculator/" data-source-title="E-Mail-Marketing-ROI-Rechner" data-tool="https://www.calculator6.com/share/62/?l=de_DE" data-width="500"><div class="calculator6-widget-title">E-Mail-Marketing-ROI-Rechner</div><div class="calculator6-widget-footer"><a href="https://www.calculator6.com/ru/email-marketing-roi-calculator/">E-Mail-Marketing-ROI-Rechner</a> - <a class="calculator6-widget-link" href="https://www.calculator6.com/">calculator6.com</a></div></div><script src="https://www.calculator6.com/share-embed.js"></script>