I believe one of the first companies to make hydraulic coupler break-away couplers was Brunning. In 1949-50 is when some of them first appeared on the Minneapolis Molines as a 3 piece coupler, two male ends and a connecting sleeve in the middle. The connecting sleeve had a bracket that fit into a support iron to allow movement. Some of the AC's had the male end on the tractor, male end on the ram and connected with the sleeve. Some place I saw a picture in an AC manual with a strap and chain to hold the bracket. It must not have worked real well for AC as I don't think it was used long. The Brunning couplers were used on MMs until the mid 1960s when Pioneer was getting more popular. They were also used on some of the 4000-5000 Fords.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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