Signals Experimental Establishment Pamphlet No. 7 Fullerphone Mark III, June 1918

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Signals Experimental Establishment Pamphlet No. 7 Fullerphone Mark III, June 1918 - Title page.jpg
Signals Experimental Establishment Pamphlet No. 7 Fullerphone Mark III was issued by the Signal Service (France) during the First World War.

The pamphlet has a general and technical descriptions along with instructions for working and a large number of figures and schematics.

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