Polarential telegraph system (English Wikipedia)
Analysis of information sources in references of the Wikipedia article "Polarential telegraph system" in English language version.
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bldrdoc.gov
its.bldrdoc.gov
This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 2022-01-22. (in support of MIL-STD-188).
books.google.com
- Frank Jay (1977). IEEE Standard Dictionary of Electrical and Electronics Terms. p. 501.
A direct-current telegraph system employing polar transmission in one direction and a form of differential duplex...
web.archive.org
- This article incorporates public domain material from Federal Standard 1037C. General Services Administration. Archived from the original on 2022-01-22. (in support of MIL-STD-188).