more detailed pictures from all angles help and narrow down the little things to accurately tell what version they, the korell particularly, with the back open
but it is a very safe bet the first is a Balda Fixfocus could be 1938 but probably a 1939 model going by the finder, with optional body release button (i cant read the lens serial number either), very common camera, if you have a VW beatle this might go well with it because Balda used to advertise this a the peoples camera, "Volkskamera" . it was low down in Balda's range, the juwella is the same camera but lower specked again, this basic camera was sold under lots of different names, it also went on to be produced after the war.
this one just has the trioplan and prontor II, second or third from top of its range in the Fixfocus offerings, it cost 42RM, with a rim set compur 47RM, compur rapid cost an extra 10 and the faster 3,8 trioplan or trinar lens option cost another 10RM on top. it wasnt generaly available with a 4 element lens, just the triplets. probably worth $25 and up, its a matter of luck finding the right buyer for higher prices
the korell is a bit harder to confirm for certain without some more pictures (and measurement of the film mask area) but it looks to be a Korell 4x6.5 (could possibly just be a 4.5x6 though), 1931 but no fancy model name, it was available with many different lenses, some of them the prefered Tessar types, yours has the lower priced Radionar.
quite an interesting camera if it is the 4x6.5 and extremely interesting to me if you had the assessories that went with it, it took 127 film but it could take adaptors for cut film, plate film and film pack...the 4.5x6 is only 127 film and is more popular camera but i think the the former is the better and more interesting camera...it is probably worth about $50 on a good day up to $100 or so if you are very lucky