Hi Everyone. It was suggested I start a Thread for this tool. Apparently it could be an oddball type of tool
Ayrhead said:Thanks for showing me the link to the other site!
Stan S. said:I don't know why Albertson cited the Hazeltine patents in the SIOUX valve grinders. The underlying mechanical concept of alternate gear sectors providing reciprocating / partially advancing rotation was used by multiple valve grinder manufacturers. The SIOUX grinders had their own set of patents which were somewhat couched as refinements / improvements on the provisions of those earlier patents. My father-in-law was still using SIOUX hand-held grinders for engine tune-up (flathead FORD & two-cylinder JOHN DEERE ) in the 1960s. Regards, Stan S.