US. Machine matrix engraving. Matrix electroforming.
For his work on engraved matrices, see Anderson, Mike. "From Thought to Type: Part 2, "Making the Matrices." Galley Gab No. 3 (March, 2007): pp. 8-11.
For his work on electroformed matrices, see Anderson, Mike. "Practical Electrotyping Guide - How to Make Your Own Matrices." in American Typecasting Fellowship Newsletter . No. 27 (March, 2002): 9-15.
Anderson gave an excellent presentation on electroforming matrices at the 2010 American Typecasting Fellowship conference in Piqua, Ohio.
[TO DO: photographs of the materials from that presentation.]
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