Hi jayvee
All of these farm pumpers started with the F&J (Fuller & Johnson) which was imported to Australia and it looks like the Buzzacott & Roseberry were the first Australian made copies of the F&J, then Langwill, Nevertire, Challenge (sold by Sothern Cross some debate over who made it),Southern Cross pumper and IBC are there any others?
So far I have never heard of an IBC pumper being found, maybe the hade no permanent ID on them and have been missed identified as a Buzzacott or Roseberry as the latter models only hade a transfer on them and if that is missing there is no way of telling what it is a Buzzacott or Roseberry
Ian