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Star
founded c.1923
Brand that might have been used by Philips for tubes exported to the USA which competed with RCA tubes and infringed on patents they had registered in the U.S. It is not completely clear that these tubes were made by Phillips.
G.F.J. Tyne, Saga of the Vacuum Tube, Howard W. Sams&Co., Inc., 1977, pg. 428-9