Adrien Jerme Jollain, matre in 1763.
From a family of clock-makers, Jollain specialized in the manufacture of clock cases. A longcase regulator with similarly waisted body by Jollain is illustrated in P. Kjellberg, Le Mobilier Franais du XVIIIe Sicle, Paris, 1989, p. 445.
The horloger Grenier is recorded at the Vieux Palais, Rouen. In 1780 he presented to 'l'A de Rouen' un balancier de pendule secondes.