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Subject Item
isa:98788377
rdf:type
prov:Entity
prov:value
The method constituting this invention may be applied to any metal or alloy, but is particularly advantageous when applied to the hardening of copper, gold, and other non-ferrous metals which cannot otherwise be hardened except by cold or hot working or by introducing an alloy ingredient.
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n5:com
Subject Item
isap:90623900
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isa:98788377