| http://www.w3.org/ns/prov#value | - For example, in Appendix B of the 1987-88 Threshold Limit Values and Biological Exposure Indices (ACGIH 1987/Ex. 1-16), the ACGIH states that reactive metals and alloys such as aluminum and titanium are arc-welded in a protective, inert atmosphere such as argon.
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