Note
Lafayette catalog 84 (1944, copyright 1943), p. 91.
Radio's Master, copyright 1943, p. H-79.
Radio News, Feb 1944, p. 47.
This same device is also advertised as being made by McElroy. See, for example, QST, Feb 1943, p. 74. In the QST photo, the MS-700 can be seen with a McElroy nameplate.