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Post Office Green Paper
Post Office Green Paper No.26 - "Voice-Frequency Telegraphy". 32 pages with black and white photos and diagrams.
Collection Area
Industry
Item Number
91.46I/15
Acquisition
Collected officially, 11/9/1991
Measurements
Length
(mm): 245
Width
(mm): 186
Material
paper
metal
Location
In store
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