Signalling;
how to learn the commercial code and all other forms of signalling as required at B.O.T. examinations. Marconi wireless telegraphy explained.
Contributors: | |
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Format: | Book |
Language: | English |
Published / Created: |
Glasgow,
J. Brown & Son,
1907.
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Subjects: | |
Notes: | "Seventh edition." Physical description: 132 p. incl. diagrs., col'd plates. front., illus. 18 cm. more |