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Micro ECM
processes selective metal removal in the micron range. Applications vary from motor bearing grooving to airflow turbulator contours. http://www.microecm.com/
Suron
specializes in photo-chemical machining and photo-etching to produce chemically milled metal parts.
Hi Electronics
specializes in photo-chemical precision etching and machining of metal parts, laminated assemblies, and flexible or rigid printed circuits board.