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<x-charset iso-8859-1>Copper with Zinc or Aluminium/Tin/Manganese is a 'copper alloy' (brass/bronze) as used and tested in ASTM D130 ..... see, for example, http://www.anchorbronze.com/gearbronze.htm regards RobK http://www.splitbusaustralia.com ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe </x-charset>