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c12-21.cfm
c12-21.cfm
https://web.archive.org/web/20100226183958/http:/www.nema.org:80/stds/c12-21.cfm
ANSI C12.21
Link from a Wikipage to an external page
c12-21.cfm
https://web.archive.org/web/20100226183958/http:/www.nema.org:80/stds/c12-21.cfm