Secrecy notice for telegrams, 1900-1950

Made:
1900-1950 in Chelmsford

Secrecy notice in wood frame, made by Marconi's Wireless Telegraph Company Limited, Chelmsford, Essex, England, 1900-1950

Details

Category:
Radio Communication
Materials:
glass, paper (fibre product) and wood (unidentified)
Identifier:
1959-207
type:
regulatory sign
taxonomy:
  • visual and verbal communication
  • sign - promotional or advertising artefact
credit:
Lent by the Museum of the History of Science