Agreed, very interesting read. The following caught my attention:
Van Dyk went on to design a revised 9mm bullet intended to provide some expansion. The bullet retains the conical point but has a high ridge surrounding it. It was known as the 'Cobra' bullet, which was further developed into the 'Eliminator' or 'Sentry' bullets. These have been produced in a wide range of pistol calibres, including the 7.62x25 Tokarev. Bullets similar to the THV have also been made by Ram Products in 9mm, .38 and .45 calibres.
I wonder if the Federal HydraShok is a variation on this design - or did it come first? I believe the HydraShok design was created in the early 80s.