The one with Y/C is Yashica, the one on right looks like Canon, hard to tell with only part of it showing.
Lens mount guide here
SLR Lens Mount Identification Guide
Rio - I've looked at my Minolta lenses several times, I have a 45, 55 and135mm, but after taking a good long look I'm not sure if I'd want to try and convert one. Bolt pattern wouldn't work, aperture arm is on the outside...might be quite a project...I have or can get the taps to fix the bolt pattern, and 8 years as a machinist so I know how, but I don't know of a way to get aperture control to work. At least I think that's the aperture control arm...then again nothing there I'd really benefit from, I have several 50's and a 135 or two already...
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