A relative of mine worked at a medical devices company (brain sensors). She told me how small intricacies of the manufacturing process were critical to reach go

A relative of mine worked at a medical devices company (brain sensors). She told me how small intricacies of the manufacturing process were critical to reach good enough yield or functioning devices, at all. The critical process steps were closely guarded and only a handful employees knew how to do them. The devil is often in the details - and the moat, too.