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Hand warmer - Wikipedia
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Amazon.com: Reusable Pocket Hand Warmers,Reusable Snap Heat Pack, Hand Warmers Click, Hand Warmers Boil Click Heat Pocket Hand Warmer, Pouch Gel Hand Warmers Cute Long Lasting Warmth for Camping, Outdoor (RED) :
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Primer: How Do Hand Warmers Work? | HiConsumption
Storing Solar Energy in Sodium Acetate-Based Hand Warmers Using Light-Absorbing Particles | ACS Applied Energy Materials
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