This video www.RexMetals.com reports on aerospace metals Invar. The video goes through hastelloy X, Invar invented, its uses, discoveries and modern Metal. (http://lh4.ggpht.com/_veNt4wCNwxE/TBXd-HIyhGI/AAAAAAAAIjM/7cc3ptMlmC8/s72/Invar_steel_hastelloy_X.jpg)
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