Diagram and article from below.
www.protoolreviews.com
Milwaukee, and Ryobi, and Ridgid are all made by Techtronic industries, a Hong Kong based organization. (Ryobi and Ridgid are licensed) so 3 of the 4 aisles of power tools at a certain hardware store are all the same. ! That is pretty surprising.
Makita is a Japanese based company.
StanleyBlack&Decker also includes Dewalt, Craftsman. and many hand tools brands.
Bosch owns lots of brands too. Bosch is 90%+ owned by a charity Mr. Robert Bosch setup in 1921.

Power Tool Manufacturers and Who Really Owns Them
It may surprise you that only a handful of larger companies own your favorite power tool manufacturers. Here's who owns who...with lists!

Milwaukee, and Ryobi, and Ridgid are all made by Techtronic industries, a Hong Kong based organization. (Ryobi and Ridgid are licensed) so 3 of the 4 aisles of power tools at a certain hardware store are all the same. ! That is pretty surprising.
Makita is a Japanese based company.
StanleyBlack&Decker also includes Dewalt, Craftsman. and many hand tools brands.
Bosch owns lots of brands too. Bosch is 90%+ owned by a charity Mr. Robert Bosch setup in 1921.