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https://jp.techcrunch.com/2014/05/06/20140505coin-demoes-the-tech-that-scored-a-15-5m-round-led-by-red-point/
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複数のカードを1枚にまとめられる「Coin」、米国で予約開始
Coin » Use One Coin for All of Your Cards
https://jp.techcrunch.com/2013/11/15/20131114coin-the-electronic-credit-card-reaches-its-pre-order-goal-in-40-minutes/
