Plural-nibbed marking pen

作者: Rira Yasoshima

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参考文章(7)
Tom Liguori, Writing instrument cap ,(1992)
Wilhelm Schlink, Udo Obersteller, Double-ended pen ,(1993)
Isao Inoue, Tsutomu Shike, Twin-nibbed ball-point pen ,(1992)
Koichi Shintani, Twin-nibbed marking instrument ,(1987)
Stephen R. Gribb, Dual tip marking instrument ,(1983)