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Compasses for mathematics subject

by WANG LI
Year of Publication 12.03.2024
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Patent
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SELF-ERASING MARKER

by Nizhner, Ernest
Year of Publication 18.07.2019
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Patent
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Physical drawing device

by MA MOLI
Year of Publication 20.12.2024
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Patent
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ボールペン

Year of Publication 27.02.2025
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Patent
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ボールペン

Year of Publication 23.12.2024
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Patent
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BALL POINT PEN

by IWAMA TAKUGO, KOIDE AKANE
Year of Publication 20.10.2022
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Patent
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PENCIL LEAD

by BANZAI, Satoru, ARAI, Hiroyuki
Year of Publication 08.09.2021
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Patent