Leica and Minolta had a very close partnership at one time. If you took the baseplate off of a Leica R4 and a Minolta XD-11 and put them side by side they looked like brothers. Which is the Leica and which is the Minolta? Hint, the Leica was more expensive.
Leica R4 and Minolta XD-11
The answer is at the following post. Leica Or Minolta Part 2