"Compact" and "Tri-Star" coexisted for two years. During the run of the C-9 model Compact, Interstate launched the Tri-Star (Red, two speed motor, chrome hood, one piece handle/switch kick, Eureka built power nozzle) for door to door sales and allowed the C-9 Compact to be sold by vac shops. Ruth Hollander and I worked together for twenty years, and I remember the day the red Tri-Star launched. She carried both models. Around 1982 was when the first "tri-star" debuted. Of course, the door to door guys got their panties in a wad over the Compact and the Compact C-9 was the last model labeled a "Compact".