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Pencil leads - what does HB, 2B etc mean? - pencilsdirect.co.uk
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DMP - Dave's Mechanical Pencils: Lead Size & Hardness
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ROTRING 1310 lead holder, 2.0mm with drop-stop function & lead hardness indicator. Circa late 1960s, OOP. | Mechanical pencils, Drafting pencil, Clutch pencil