^.... hmmmm, maybe everyone should go to the LINE site. i am pretty sure LINE made the first skiboards ever. Then they followed up with the Ostness Dragons and 1260. Salomon might have had the first twin tip, but Line was making skiboards way earlier if i'm not mistaken.
If you are bored, read this. http://www.lineskis.com/propaganda/index.php
its sweet and is a detailed description of the evolution of twintip skis.
And as a definition, i would say that twintips are evolved skis with a turned up tail, enabling the skier to ride backwards. They also have a unique flex pattern and different choice of materials to improve overall performance, and durability.
Freezing Point 32
'Straight creeping on this bitch; Blonde haired chicken head.... she turned around and it was fuckin G to the Teezy." - OMAR