The Most Outstanding Offensive Lineman Award is annually awarded to the best offensive lineman in the Canadian Football League. The two nominees for the award are the Leo Dandurand Trophy winner from the East Division, and the DeMarco-Becket Memorial Trophy winner from the West Division. Between the years of 1955 to 1973, both defensive players and offensive lineman had to compete for the CFL's Most Outstanding Lineman Award. By the 1974 season, the league decided to make two separate awards for both defensive players and offensive lineman.
References
CFL's Most Outstanding Offensive Lineman Award Wikipedia(Text) CC BY-SA