I believe they were called a Collier type machine. Built sometimes with a single handle, sometimes a U shaped double linked one. They were built by C-H, Cougar & Hunter, and the RCBS Green Machine. When everthing is right they worked great, BUT their primer feed systems were easily subject to jams, hard to clean of priming residue and therefore had a high potential for detenations. They are best left alone for that reason.