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.
Keywords from Image Description:
Atwater Kent Type TA detector and stage AF amplifier Bayernhof Museum DSC. en Exhibit in the Bayernhof Museum St Charles Place O'Hara Township Pittsburgh Pennsylvania USA Photography was permitted in the museum without restriction own Daderot cczero Radios in Bayernhof Museum Uploaded with Atwater Kent Type TA Audio amplifier