Signals Training Volume III pamphlet No26 Switchboards U.C. 10-line and 6-line 1940
This exceptionally scarce original manual deals with operation of the 6 and 10 line universal Call (U.C.) field exchanges. Issued from 1940this example was authorised by the War Office on 23/7/1941 Photo shoes actual example that will be sent
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Signals Training Volume III pamphlet No26 Switchboards U.C. 10-line and 6-line 1940
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