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I use a mechanical pencil every day. Breaking the lead is a big bummer, even for a semi-amateur like me. This liquid thing makes breakage, umm, errr.... impossible, yeah, thats what I'm looking for, impossible.
And draftsmen (yeah, there are still mechanical drafting tables everywhere), they in theory get to finally toss out the leads, the sharpening tools, the wiping tools, etc.
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Registered Linux user 260423.
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