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If the diamond mark is missing, the tube was likely made by Siemens or another of the Dutch Philips companies.
By 1906 they were building arc radio transmitters, and by 1907 were demonstrating radio transmission of music, only a year after Fessenden used his microphone to broadcast voice in the USA.
By 1935 they were building the first tape recorders, along with AEG in Germany, and by 1936 were transmitting the first television broadcasts of significant power, that being the coverage of the Olympic games in Berlin.
The codes printed on the glass may be Telefunken codes, but without the diamond mark in the bottom glass the tube was not actually made by Telefunken.
Telefunken was an old German company created back in 1903.