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Marconi official training signals course no. 1 (catalogue number B629)
Sound
Maker: The Gramophone Company Ltd The Wireless Press Ltd
Side 1: Foreign messages (fast) (9510) Side 2: Assorted messages (fast) (9511)S03090
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Marconi official training signals course no. 1 (catalogue number B628)
Sound
Maker: The Gramophone Company Ltd The Wireless Press Ltd
Side 1: Commercial messages (medium) (9508) Side 2: Code and cypher (9509)S03089
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The Marconi official training signals course no. 2 (catalogue number B790)
Sound
Maker: The Gramophone Company Ltd The Wireless Press Ltd
Side 1: French press (9528) Side 2: Italian press (9529)S03091
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The Marconi official training signals course no. 2 (catalogue number B791)
Sound
Maker: The Gramophone Company Ltd The Wireless Press Ltd
Side 1; Spanish press (9530) Side 2: Portuguese press (9531)S03092