Have we ever used #""^56 "Co"# for any interesting industrial purpose(s)? Cite any sources you may find on this.
Not industrial, but interesting...
In August 2014, a team of astrophysicists reported the discovery of cobalt-56 in supernova SN2014J, an exploding star 11 million light-years from Earth. The supernova emitted about 60 percent of the sun's mass in cobalt-56, the researchers reported in the journal Nature. The isotope has a half-life of 77 days and gradually decays into iron-56.
Cobalt has unique magnetic properties and are being examined in food science issues to control contamination, but the note didn't say Co-56 was being used.