Vintage Ads in General Chat Posted March 26, 2016 Loadstar: Thanks for that advertisement from Cockshutt with Ivan MacRae's photo. Ivan MacRae was the Chief Engineer of Cockshutt's Tractor Division. He is the Godfather of live or independent PTO on farm tractors. Ivan was from Glengarry County, Ontario and graduated from Queens University in Kingston, Ontario in 1937. In about 1940 he started working on the concept of a live PTO on the tractor Cockshutt was proposing to build them selves. The tractor became the Cockshutt 30 and the first one went off the assembly line in October 1946. Soon afterwards all other tractor manufacturers were scrambling to build their own version. The IH version was not introduced until 1954 when it debuted on the Farmall Super M-TA and Super W6-TA. This was seven years later. This is all detailed in the book "About Cockshutt" written by Bill Cockshutt himself.