Wireless Vacuette (1919-1925) The Vacuette Electric (1925-1928) Scott Fetzer Sanitation System (1928-1934) Kirby Model C/R (1934-1937) Kirby Model 2C/2R (1937-1939) Kirby Model 3C/3R (1939-1940) Kirby Model 4C/4R (1940-1941) Kirby Model 505 (1945-1948) Kirby Model 508 (1948-1949) Kirby Model 509 (1949-1950) Kirby Model 510 (1950-1951) Kirby Model 511 (1951-1952) Kirby Model 512 (1952-1953) Kirby Model 513 (1953-1954) Kirby Model 514 (1954-1955) Kirby Model 515 (1955-1956) Kirby Model 516 (1956-1957) Kirby Model 517 (1957-1958) Kirby Model 518 (1958-1959) Kirby Model 519 (1959-1960) Kirby Model 560 (1960-1961) Kirby Model 561 (1961-1962) Kirby 562 Sanitronic (1962-1963) Kirby Sanitronic VII (1963-1965) Kirby Dual Sanitronic 50 (1965-1967) Kirby Dual Sanitronic 80 (1967-1969) Kirby Classic 1CR (1969-1973) Kirby Classic Omega 1CB (1973-1976) Kirby Classic III 2CB (1976-1979) Kirby Tradition 3CB (1979-1981) Kirby Heritage 1HD (1981-1984) Kirby Heritage II 2HD (1984-1987) Kirby Heritage II Legend 2HD (1987-1989) Kirby Legend II 2HD (1989-1991) Kirby Generation 3 (1990-1993) Kirby G4 (1993-1997) Kirby G5 (1997-1999) Kirby Gsix (1999-2002) Kirby Ultimate G (2002-2003) Kirby Ultimate G Diamond Edition (2003-2006) Kirby Sentria (2006-2012) Kirby Sentria II (2012-2014) Kirby Avalir (2014-2017) Kirby Avalir 2 (2017–Present) Commercial/Misc Models Kirby Utility Handvac (1935) American Lincoln Super Sweep (1972-1978) Super Vac 180 (1978-1982) Kirby ComVac 1300 (1982-1984) Kirby ComVac 1600 (1982-1984) Kirby ComVac 2200 (1982-1982) Kirby ComVac 2400 (1982-1982) Kirby ComVac 2600 (1982-1982) Kirby ComVac 2800 (1982-1982) Kirby Split Second (1984-1987) Kirby Split Second 2 (1987-2015) Kirby Vacuette Handvac (1989-2010) Kirby Split Second 3 (2015–Present) Legacy Sales A major facelift was done to the Kirby line with the Generation 3 series in 1990, with G3 and later models maintaining a traditional form, but with a modern look. Internal improvements between models has continued (such as HEPA filtration, beginning with the Gsix in 1999), but outward changes throughout the entire Kirby production have been mostly in color scheme or minor detail. Pricing of used Kirby vacuums can vary widely. A number of companies offer refurbished vacuums. Criticism of marketing and sales practices The practices of some of Kirby's independent distributors have been subject to criticism. The Kirby is included by Lon L. Fuller and Melvin A. Eisenberg, Professors of Contract Law at Harvard Law School and UC Berkeley School of Law/Columbia Law School, as a textbook example of unconscionability. Kirby has been subject to relentless criticism by consumer protection agencies. As of 1999, of the 22 state consumer protection agencies, 15 had received a total of more than