I don't make any claims on being an expert, but if I had to guess I'd say the two on the top are jointers or strippers (both terms refer to the same tool)and the ones on the bottom are spiders. The former are used in conjunction with a flat file to even out the heights of the teeth on an unevenly worn saw before sharpening. The latter are used on worksaws to roughly gauge the set of the teeth -approx. 0.012"-0.015" for hardwoods and 0.020" in softwoods. In the case of a racing saw one would use a micrometer to set the teeth as they are more accurate.
This is a great thread. Those who posted pics. have some really nice saws. Thank you for sharing them.
Thanks for the info, the father in law passed those on to me,, he did show me how they worked,, but that was 20 years ago, he also left me a saw that is near new it has 'SIMONDS' or 'SIMONS' etched into the steel. I forgot where I put my saw for pictures.:help: