The story
1927
Tracta appeared at 24 Hours of Le Mans for the first time in 1927. It brought two Type A Gephi. Car number 19 did not start due to an accident on the way to the circuit and number 20 finished 7th.
1928
Three cars competed in the 1928 Le Mans 24 Hour race, two Type As, including one driven by Grégoire (in partnership with) himself, and one Type A Gephi. All three finished, albeit well down the field.
1929
Tracta returned to Le Mans in 1929, now with four cars, three Type As using supercharged 4-cylinder four-stroke engines and a fourth one, a Spéciale, with experimental two-stroke engine designed by the engineer Cozette (who at the time was better known as a designer of superchargers). Only two of the Tractas competing in 1929 completed the race, the two-stroke experimental car retiring after 43 laps.
1930
By 1930 only two Type As appeared a Le Mans, with an overall 8th and 9th finishing position.
From Wikipedia’s article on Tracta, shared under CC BY-SA 4.0.4
