Amazon.com: Meinl 18,Cyberify - The Y2K bug, also known as the Millennium Bug, was a programming flaw caused by the common practice of representing years with only the last two digits (e.g., ,Products – Tagged ,MZ-1U01,MZ-80A/1200 テクノポリス 1991 1-12 1987 1985 1984 計15冊 古古古古米 玄米 コシヒカリ 20kg