Instruction manual for Marconi “Seagraph”, “Seavisa” and “Visagraph” echo-sounding equipments.
Marconi International Marine Communication Company Ltd — 1949?
Author Marconi International Marine Communication Company Ltd
Date 1949?
Publisher Marconi International Marine Communication Company, Chelmsford.
Location Maritime Museum
Geographic Not Geographic
Dewy 623.8938 MAR
Main Scientific
AcessNo 20083