Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Post Office technical pamphlet for workmen
Blue cover with black print. Technical pamphlet - " Principles of Telephone Exchange Signals". 26 pages.
Pwnc
Diwydiant
Rhif yr Eitem
91.34I/8
Mesuriadau
Meithder
(mm): 181
Lled
(mm): 121
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.