This won't help much, but...
Neither appears in the 1950 general catalog, price list, nor in any of the suppliments I have. From the number sequence tho, both were probably obsolete by 1950.
all KMO prefixed numbers are general purpose (not vehicle specific) shop tools.
N prefix numbers are somewhat rare and don't follow any pattern I can discern.
Wild guesses....top - hub wrench??? , bottom - gauge for something.....