British patent n° 20981 – Improvements relating to the Production, Regulation, and Utilization of Electric Currents of High Frequency, and to Apparatus therefor
Published September 22, 1896
Printed in London
1s Edition. Original Printed patent disbound. About 27cm by 18cm some wear and tear due to the disbinding. Item #31144
Price: £400 (i.e. €437 about)
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