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dial_mechanisms.pdf
POST OFFICE ENGINEERING DEPARTMENT.
TECHNICAL INSTRUCTIONS, XXV. (Provisional Issue.)
Automatic Telephone Exchange Systems.
Part 24A.-Apparatus-Description and Adjustment of Dial Mechanisms. DIAGRAMS.
(The Instruction relating to these Diagrams is issued separately.)
ENGINEER-IN-CHIEF'S OFFICE, GENERAL POST OFFICE, LONDON, E.C. 1., May, 1928.
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