SOMUA (H.Ernault SOMUA) Indexing Apparatus Type No.1. Universal Decimal-base Divider 1-2-3
SOMUA (H.Ernault SOMUA) Indexing Apparatus Type No.1. Universal Decimal-base Divider 1-2-3 Operator's InstructionManua l with Tables of Division and tables of Change Gears, Approximate Angles and English Leads for Cutting Spirals.