1972
Aluminum tubes stacked end-on, filling the frame.
The company
Alcan Aluminium Limited, of 1 Place Ville Marie, Montreal, Canada, produced primary and fabricated aluminum, with quantities stated in short tons of 2,000 pounds.
Alcan Aluminium Limited Annual Report 1972, p. 2
That year
Canadian primary aluminum production decreased to 880,000 tons in 1972 from 945,000 tons in 1971, averaging 85 percent of capacity.
Alcan Aluminium Limited Annual Report 1972, p. 21