A NEW method of navigation has been evolved by the “Société Industrielle des Precédés Loth,” and was recently demonstrated at the experimental station installed at Vaux‐sur‐Seine, near Meulan, some 20 miles west of Paris.
de Marolles, R.J. (1930), "The Loth Navigation System: A Twin Rotating Beacon Method of Emitting Wireless Signals that can be Picked up on an Ordinary Receiver", Aircraft Engineering and Aerospace Technology, Vol. 2 No. 5, pp. 107-108. https://doi.org/10.1108/eb029264
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