DISRAELI GEARS
The league table of Tour de France wins using a derailleur (up to and including 2019) goes:
Year by year the results are:
Simplex Prestige (532) 1962
Simplex Prestige (537) 1965
Campagnolo Nuovo Record (1020/A PATENT-74) 1974
Campagnolo Super Record (4001 PAT.80) 1980
Campagnolo Record (0102050 'C-Record' 1st style) 1984