As I suggested earlier, one's view of how the SLR developed in the '50s and '60s is very much dependent on your location during that time frame.. Unfortunately, it seems most APUGers refuse to include even their country information in their profile. From his name (Yashinoff ) and the cameras he mentioned, I might assume he might be Eastern European - but I may be incorrect.
APUG is an international forum - which is great - but a little more information might make it more meaningful when making comments. I still don't understand the reluctance to identify your home country.