1979
Underground drill crew, jumbo and noise meter.
The company
Inco Limited, incorporated in Canada, was the world’s leading producer of primary nickel and a substantial producer of copper and precious metals.
Inco Annual Report 1979, p. 2
That year
Inco’s first-half 1979 earnings were depressed by the Sudbury strike, which began in September 1978 and was settled in June 1979.
Inco Annual Report 1979, p. 4
Source
archive.org/details/McGillLibrary-635140-39761
Other years 1980