In 1937 Carlo Perrier & Emilio Segre filled in no. 43 on this table, the first entry to be artificially produced
In 1937 
its isotope 97Tc became the first element to be artificially produced, hence its 
name ... Other technetium isotopes are not produced in significant quantities by 
fission; .... to a 1937 experiment in Sicily conducted by Carlo Perrier and Emilio 
Segr.