The idea was actually from Pures seiners, where a smaller version of the Ulstein Shark Jaws and Triplex Stoppers were used when connecting the seine wire.
Most of the crews on the early OSVs in Norway were ex. fishermen from the district around Ulsteinvik and Averøya (the home of Triplex)
They brought up the idea that something similar, but stronger, could be developed for OSVs.
PS> That is how the UT 704 design was born as well.