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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