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Darned if you aren't right, Lisa! Googled it: Sadow applied for a U.S. patent in 1970, and in 1972, he was granted the first successful patent on wheeled suitcases. Macy's sold the first suitcases in October 1970.
Stable version came out in 1980.
Kinda with you on discovery. I saw my first wheeled suitcase in 1989, a huge near-trunk sized case, and wished I had one instead of wagging around two average bags and a carryon on a trip to Russia.