Otto A. Knopp (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Otto A. Knopp" in English language version.

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archive.org

Shepard, William Martin; Allen Green Jones (1910). The Watthour Meter. Technical Publishing Company. pp. 134. Otto A. Knopp.

books.google.com

Magalhaes, F. V. (1921). "Annual Report of Instruments and Measurements Committee". Transactions of the American Institute of Electrical Engineers. 40: 787. doi:10.1109/T-AIEE.1921.5060721.

doi.org

Magalhaes, F. V. (1921). "Annual Report of Instruments and Measurements Committee". Transactions of the American Institute of Electrical Engineers. 40: 787. doi:10.1109/T-AIEE.1921.5060721.