Just curious why the Draupnir? To me, I’d put a YYJ in there for first bi-metal, then whatever yoyo was the first V shape, not sure I’d put the Draupnir in there, but maybe?
Also, I’d probably add the Duncan Butterfly to the list, which was around 1958. That’s a huge step for yoyos going to the butterfly shape.
Others:
1968, Duncan began making the plastic Butterfly (first mass produced plastic?) with a metal axle.
1997/98 - ProYo Cold Fusion - world record holder for sleeper
2004 Duncan Freehand Mg
2007/08 - DocPop Bolt
2010 - One Drop 54 (first side effect yoyo)