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Help with using an express card USB 3.0 on x200 : r/thinkpad
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Buy 3Ports Hidden USB 3.0 Expresscard 54mm Adapter Converter for PCMCIA Express Card Laptop Notebook PC at affordable prices — free shipping, real reviews with photos — Joom
New ThinkPad Mod: ExpressCard to NVMe SSD Adapter - Thinkpads Forum
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How to get USB3 devices connected to a T61p with 54mm PCMCIA - Thinkpads Forum