Andrew In the US model numbers of parts do not appear to be eligible for copyright protection. I'm guessing they added digits to conform to Hasag's part numbering scheme. I'm not even sure GPA manufacturers in the US spent any effort in copyrighting there sales and service literature back in the day. The Coleman 8-55 Parts Catalog No.32A is not copyrighted. I have some earlier hand typed service manuals from Coleman that were not copyrighted.