I think that they are all playing off of a name that is/was big. Chicago Pneumatic or one of them used to be a great company, but all the cheap Harbor Freight crap uses CP on the logos, but is really something else.
That make sense?
Like buying a shirt that has the red square next to the white square, and the initials T.H. The T.H. stands for Thomas Hillinger instead of Tommy Hilfiger.