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See Matrix.

er. -- Letter punch, a steel punch with a letter engraved on the end, used in making the matrices for type. -- Letters of administration (Law), the instrument by which an administrator or administratrix is authorized to administer the goods and estate of a deceased person. -- Letter of attorney, Letter of credit, et…

esponds to a line of separate types. By pressing upon keys like those of a typewriter the matrices for one line are properly arranged; the stereotype, or slug, is then cast and planed, and the matrices are returned to their proper places, the whole process being automatic.