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If people like both of them why don't manufacturers make a camera that
uses both
technologies like those dual DVD/VHS players?


WTF? Crappy film cameras?
I don't know what you are doing, trolling like that.

I will still answer your question though:

Leica makes a camera that is both a DSLR and a 35mm SLR.
It is however, too expensive, and uses Leica Glass, which is entirely out of
the realm of possibility for most people.
Leica glass is also becoming out dated, with lenses from canon and Nikon
becoming ever more advanced.