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单词 proof-letter
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proof-letter
proof-letter n. Type-founding Obsolete a letter cast to test the accuracy or size of a type-mould.
ΘΚΠ
society > communication > printing > types, blocks, or plates > relating to type > [noun] > to test accuracy of mould
proof-letter1683
1683 J. Moxon Mech. Exercises II. 154 Then he Casts a Proof-Letter or two.
1688 R. Holme Acad. Armory iii. iii. 124 Proof Letters, are..Letters by which the Founder or Maker of the Moulds doth justifie his Mould by. And also by them new Fount Letters are tried by setting them together in the composing Stick.
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