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Why are 6B pencils used? - Quora
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Why were the letters 'H' and 'B' selected to designate pencil lead hardness (2H, H, HB, B, 2B, etc.)? - Quora
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What do 'H', 'HB', 'F', 'B', and 'E' stand for on art and architectural pencils? - Quora
What do 'H', 'HB', 'F', 'B', and 'E' stand for on art and architectural pencils? - Quora
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