How do on-metal NFC tags work?
10pcs NFC Tag Black NFC Stickers Anti Metal NFC Tags on-Metal NFC Tag Sticker Programmable NFC Tags for Metal Work Perfectly All NFC-Enabled Cell Phones & Devices : Office Products
World first' plastic NFC tag opens up new possibilities for NFC deployments • NFCW
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On-Metal NFC Tags - Seritag
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Seritag NFC Tags
SAG develops miniaturized NFC tags readable from within metal