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of St. Leonard's Avenue, Bedford.
c1920 Company established by Frank Hartop
1922 Company moved top St Leonards Avenue
1922 The horizontal model 'S' replaced the 'AV'
c1922 Started producing an i/c engine
1924 The S type engine introduced in 0.33, 0.5, 0.75, 1 and 1.24 hp sizes.
1927 Company moved to Miller Road, Bedford
1928 Introduced the FE vertical two-stroke 1.25 hp engine
1929/30 The H type vertical four-stroke engine introduced rated at 1 hp / 750 rpm.
1933 The H type governed was introduced and remained in production until 1943
M type introduced
1940 Company incorporated
Post WWII Engine production re-started by Frank Hartop, Junior but after a couple of years he retired and the production was taken over by the Premier Engine Co (or possibly R. Percy Robinson Motor and Engineering Co)
1949 Frank Hartop dies
1950 Company dissolved