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Watch of the SPRING DRIVE System
スプリングドライブ方式の腕時計(時を携帯する,<メカライフ特集>時をつかむ)
2008
Journal of the Society of Mechanical Engineers
スプリングドライブ方式の腕時計(時を携帯する,<メカライフ特集>時をつかむ)