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Polymet - Reine Metalle. Ferrite rod 8 x 100 mm, round rod, ferrite core, round rod 10 cm antenna ferrite DCF77, soft magnetic manganese-zinc-ferrite : Amazon.nl: Business, Industry & Science
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Amazon.com: CynKen 5pcs 10x140mm Ferrite Rod Bar Loopstick for Radio Antenna Aerial Crystal About 0.4"x5.5" : Electronics
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Amazon.com: LTKJ 5PCS Black MnZn Ferrite Rod Bar Loopstick for Radio Antenna Aerial Crystal AM 10X200mm : Electronics