1950 - 1952: After a successful fox hunt, inventor Donald Bergstrom of Eagle Bend, Minn. poses aside one of his recent air-sled creations. Don's innovative machines opened-up winter in an entirely new way and were the direct forerunners of the Trail-A-Sled and eventually the Scorpion snowmobile. Note - hunting of this type was quite common and completely legal during this era. Bergstrom family photo. Title and date. See Terms of use. Link to Home.