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History of the manufacturer  

Penton Engineering Co.; London

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Name: Penton Engineering Co.; London    (GB)  
Abbreviation: penton
Products: Tube manufacturer

Penton Engineering Co.
15 Cromer St, Kings Cross, London WC1

The company made three tubes including the R type. Advertisement in Wireless World, February 1924. Production began in 1924 but ended in 1926. 

Shown on page 393 of Tyne's "Saga of the Vacuum Tube".

Production: 1924 - 1926

This manufacturer was suggested by Fin Stewart.