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Nov 16
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petapeta: ボールペンの芯をスパイラル形状にしたら充填インクの量が2倍になった　なぜ誰も思いつかなかったのか

petapeta:

ボールペンの芯をスパイラル形状にしたら充填インクの量が2倍になった　なぜ誰も思いつかなかったのか

(via orehmi)

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