‘frequency’ historical pictures (exact matches)

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Modern Wonders, 1938: A 500,000, Volt Flash
Modern Wonders, 1938: A 500,000, Volt Flash
'Jedi' helmet, used with Cryogenic Magnetic Resonance Imaging Machine
'Jedi' helmet, used with Cryogenic Magnetic Resonance Imaging Machine
The treatment of malignant tumours by electrical currents
The treatment of malignant tumours by electrical currents
Page from Gamage's General Catalogue (96th edition), c 1927
Page from Gamage's General Catalogue (96th edition), c 1927
Circuit diagram of d'Arsonval's high frequency apparatus
Circuit diagram of d'Arsonval's high frequency apparatus
Turntable used as part of a DJ setup
Turntable used as part of a DJ setup
Page from Gamage's General Catalogue (96th edition), c 1927
Page from Gamage's General Catalogue (96th edition), c 1927
Storm Tracks and Frequency, World
Storm Tracks and Frequency, World