סרטים: Gpo General Post Office Film Unit
- 1938
North Sea
North Sea5.71938HD
...
![North Sea]()
- 1938
How the Telephone Works
How the Telephone Works01938HD
...
![How the Telephone Works]()
- 1940
How the Teleprinter Works
How the Teleprinter Works01940HD
...
![How the Teleprinter Works]()
5.71938HD
...
01938HD
...
01940HD
...