Can't directly answer the question, but I have noticed that Stanley tended to use the "purchased" name for a while before slowly making it disappear. I'm a fan of the North Bros. Yankee tools (screwdrivers, push drills), with a loyalty to the actual North Bros. tools because North Bros. was headquartered in Philadelphia, my bride's hometown. After Stanley purchased the company in 1946, they went through a period - not sure how long - of labeling the tools "North Bros, a division of Stanley..." before just labeling them "Stanley."
I wish there were more catalogs for Stanley tools; it'd be nice to be able to do a year-by-year comparison to find the change point for this kind of thing.