What brands of cameras did photographers in China use in the 1960s and 1970s?

Lulai series dual-lens reflex cameras swept the world in the 1940s, 1950s and even the early 1970s. In the fifties and sixties, it was a symbol of professionalism. At that time, those who could walk on the street with "Lu Lai" on their backs were either professional photographers or public security personnel. There are many similar ones, please go and see the resources.