This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Philips GM oscilloscoop. en The Philips GM is laboratory scope built in The frequency range is Hz to MHz It is all vacuumtube device own Paulus Philips oscilloscopes
Page 2023 Free-images.com. All images are Public Domain