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Post Office technical pamphlet for workmen
Blue cover with black print. Technical pamphlet - "Elementary Principles of Telegraphy and Systems up to Morse Duplex". 34 pages.
Collection Area
Industry
Item Number
91.34I/4
Creation/Production
Post Office Engineering Department
Acquisition
collected officially, 10/9/1991
Measurements
Length
(mm): 181
Width
(mm): 122
Material
Paper
Metal
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