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"Numbers as designation were first used by Conté and later by John Thoreau, father of Henry David Thoreau, in the 19th century.[c] Although Conté/Thoreau's equivalence table is widely accepted,[citation needed] not all manufacturers follow it; for example, Faber-Castell uses a different equivalence table in its Grip 2001 pencils: 1 = 2B, 2 = B, 2½ = HB, 3 = H, 4 = 2H.
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