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Huawei Mate 20 - Wikipedia
Huawei Original NM Card 256GB Apply to Mate 20 Pro Mate 20 X P30 Huawei USB3.1 Gen 1 Nano Memory Card Reader|Network Cards| - AliExpress
Amazon.com: Enhanced Version NM Memory Card 256GB 90MB/S Nano Memory Card Nano Card only Suitable for Huawei P30/P30pro/P40 series/Mate20 Series/Mate30 Series/Mate40 Series Nano 256GB Card : Electronics
What is Nano Memory and where is it headed? - Android Authority
Huawei Mate 20 Pro might support memory card expansion but it's not microSD - SoyaCincau
This is the Huawei NM Card included in its Mate 20 phones – Phandroid