Pen register (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Pen register" in English language version.

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patents.google.com

  • Samuel F. B. Morse, Improvement in the Mode of Communicating Information by Signals by the Application of Electro-Magnetism, U.S. Patent 1647, June 20, 1840; see page 4 column 2
  • See for example, Frank Wood's Telegraph Register, U.S. Patent 338,329, Mar. 23, 1886.
  • William F. Singer, Electrical Automatic Fire-Alarm System, U.S. Patent 436,640, Sept. 16, 1890; see page 3 line 48
  • Bernice J. Noyes, Electric Signalling Apparatus, U.S. Patent 534,908, Feb. 26, 1895; see page 1 lines 82-83.

semanticscholar.org

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