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ISO 9180:1988, Black leads for wood-cased pencils -- Classification and diameters
🇺🇸 United States
ISO 9180:1988, Black leads for wood-cased pencils -- Classi…
By: ISO TC 10/SC 9
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ISO 9177-2:1989, Mechanical pencils -- Part 2: Black leads -- Classification and dimensions
🇺🇸 United States
ISO 9177-2:1989, Mechanical pencils -- Part 2: Black leads …
By: ISO TC 10/SC 9
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