Normalnorm said:
Leaf shutters were used in view camera lenses, simple cameras such as Brownie's and even enthusiast amateur cameras such as Yashica, Canon and Argus. Hasselblad and Rollei were premium cameras that used leaf shutters. While Rollei had fixed lenses in their Rolleiflexes, Hasselblad adopted leaf shutters in their classic 500C designs.
Many non interchangeable lens cameras had leaf shutter, often bought from a third party - most good leaf shutter were made by Compur (part of Zeiss, IIRC) or Copal, and incorporated into the lens or camera design.
IIRC Hasselblad tried first with a FP shutter, but it proved not enough reliable, and switched to a leaf one. That's why the Kiev (which was a copy of the original Hasselblad), had a FP shutter. Larger FP shutters (bigger formats) were more difficult to build than smaller one for 35mm.
IIRC again, leaf shutter in MF and large format lenses allowed for complete sync speeds, but weren't very fast shutters either - reaching at most often only 1/500, or even less. Anyway, they weren't camera designed for action photography.