S. E. Catalogue 3 The Canadian Marconi Completely Modulated Continuous Wave Transmitter Amateur Type 13939 — 200 metre wavelength … fronted with a substantial hard-rubber panel, on which are THE transmitter is designed to meet the demand for mounted the control switches and necessary terminals, all compact, portable and reliable continuous wave finished in dull nickel. Graduated scales about the switch apparatus operated…
Radio
Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.
