Occurrence of Attributes in Original Text
The text related to the cultural heritage 'Grimeton Radio Station, Varberg' has mentioned 'Forest' in the following places:
| Occurrence Sentence | Text Source |
|---|---|
| Vacuum tube electronic oscillator transmitters, which used the triode vacuum tube invented by Lee De Forest in 1907, replaced most pre-electronic transmitters in the early 1920s. | WIKI |