John:

From what I have learned the Robin company and the MIA company are two different companys. They must work well together as you see them often on different tractors expecially on 15-30 and 22-36 IHC tractors.

I bet they were an easy sell as they would have been much quieter and easy on the ears than origional Wallis manifolds and they would get the exaust up in the air and out of your way so you don't have to breathe the exaust all day long.

Here are a couple ads I have found for the Robinson Company.
I wonder if this companys founder is one of Malcom's long lost relatives??