CQD as Distress Signal

Date: January 7, 1904 • Location: Rome, Italy

The Marconi International Marine Communication Company specified CQD (audio featured) as the distress signal to be used by its operators.

The Marconi Company was a British telecommunications and engineering company founded by Italian inventor Guglielmo Marconi in 1897 which was a pioneer of wireless long distance communication and mass media broadcasting, eventually becoming one of the UK's most successful manufacturing companies.