SOMUA (H.ERNAULT-SOMUA) OP-320 and OP-420 Lathes. Maintenance & Adjustments Manual.

HEB (H. Ernault-Batignolles) OP320 and OP420 Lathes: Operation and Maintenance Manual with Sectional Diagrams.

HEB (H. Ernault-Batignolles) OP320 and OP420 Lathes: Parts Manual as superb Exploded-Component Drawings and Electrical Schematics. English and French text. 158 pages