During World War II, French tanks had an AMX in their names. What do they mean by ARL?

AMX (studio? De? Architecture? D'Issy-les-Moulineaux), which is the French abbreviation for "Ishimelino Factory".

Arl (atelier de construction de rueil) is also the abbreviation of manufacturer.

?

There is also the abbreviation of Baudet-Donon-Rousseau of BDR company.