Or Blue Grass, Bluepoint, Caterpillar, Channellock, Dayton HWI, IBM, Kal, Powr-Kraft, Snap-On, Synthes, Troy-Bilt, Westcraft and Wilde.
TRW is news to me - I have a TRW DOE, but it's not in the V-Groove pattern. If you have one, I'd sure like to lay hands on it!