There isn't much online, as Wrenchmench says, Canton,IL, established by William Parlin 1842 (Probably inc '80) Made plows, cultivators, made the first lister in 1869... etc.
They are credited with helping make Kansas city the largest ag distribution point in the world at one point...
While they used 'P&O" as a tradename, they also used quite a few other names as well for various different impliments, Diamond, Canton,Jewel,Invincible,Parlin,Perfecto,Success.
In a strange twist of irony, they had Victor Jr as a tradename, but not Victor, because IHC already had that name.....