por Lewis, Rhys [autor].
por Siemens Aktiengesellschaft.
por Gay, Charles Merrick, 1871-1951 [autor] | Fawcett, Charles de van, 1887- [autor] | McGuinness, William J [autor] | Rubio, Santiago [traductor] | Munné, Antonio [editor] | Gay, Charles Merrick, 1871-1951. Mechanical and electrical equipment for buildings.
por General Electric Company. Meter & Instrument Divisions.
por Siemens Aktiengesellschaft | Siemens-Schuckertwerke.