Caption:
Italy, Tuscany: Pisa, 05/24/2025 Inside the space of the former Macelli of Pisa today used for events and exhibitions today hosts the Telephony Exhibition, the inventors arriving at Marconi and now obsolete cell phones. In the Photo: Marconi spark transmitter with syntonic system operating with frequencies 1700 - 2100 KHz. (Credit Image: © Roberto Cappello/IPA via ZUMA Press)