Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
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.
Pwnc
Diwydiant
Rhif yr Eitem
91.34I/4
Derbyniad
Collected officially, 10/9/1991
Mesuriadau
Meithder
(mm): 181
Lled
(mm): 122
Deunydd
papur
metel
Lleoliad
In store
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