<https://mdfinstruments.com/blogs/how-to-videos/how-to-find-your-mdf-instruments-reflex-hammers-serial-number>
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"How to Find Your MDF Instruments® Reflex Hammer's Serial Number"
<https://mdfinstruments.com/blogs/how-to-videos/how-to-find-your-mdf-instruments-reflex-hammers-serial-number>