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Valvo (Philips)
1932 - 1999
Valvo started as Radio-Roehren-Fabrik GmbH (RRF GmbH) in 1924 as the vacuum tube manufactuing arm of C.H.F. Mueller GmbH which only produced X-ray tubes. The company was renamed Valvo in 1926. Phillips bought C.H.F. Mueller in 1927 and Valvo in 1932. The company was split in the 1980s and sold in 1999.
"Valvo," Wikipedia (German), http://de.wikipedia.org/wiki/Valvo (accessed 07/30/2015)
"Vacuum TUBE INFO Junction," Facebook, https://www.facebook.com/Bountyhunterstubes/posts/115331655267601 (accessed 07/30/2015)
"Vacuum TUBE INFO Junction," Facebook, https://www.facebook.com/Bountyhunterstubes/posts/115331655267601 (accessed 07/30/2015)