[On the 75th anniversary of the creation of the x-ray tube].
D005858:Germany; D049672:History, 19th Century; D049673:History, 20th Century; D007564:Japan; D009426:Netherlands; D011859:Radiography / Q000266:history*; D013679:Technology, Radiologic / Q000295:instrumentation; D014586:USSR
K 75-letiiu sozdaniia rentgenovskoĭ trubki.