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
- Object Number:
- 1959-207
- Materials:
- paper (fibre product), glass and wood (unidentified)
- Measurements:
-
overall: 270 mm x 210 mm x 15 mm, .4662 kg
- type:
- regulatory sign
- credit:
- Lent by the Museum of the History of Science