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Wikipedia definition
1. Type metalIn printing, type metal (sometimes called hot metal) refers to the metal alloys used in traditional typefounding and hot metal typesetting. Lead is the main constituent of these alloys. Antimony and tin are added to make the character produced durable and tough while reducing the difference between the coefficients of expansion of the matrix and the alloy.
Read “Type metal” on English Wikipedia
Read “活字合金” on Japanese Wikipedia
Read “Type metal” on DBpedia

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