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how was there not an infringement law suit?
It's possible to purchase elements of a design, from basic drawings to a full technical package. Shimano are usually reluctant to do that, but not insurmountably so. On the other hand, it could just be convergent design, there's nothing there that wasn't already common on moto brakes before either Shimano or Grimeca got into bicycle dick breaks
how was there not an infringement law suit?!