. . "104494204"^^ . . . . "tube"@en-us . "104320487"@en-us . "electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope"@en-us . "thermionic valve"@en-us . "0"^^ . . . . . . . . "vacuum tube"@en-us . . . "tube"^^ . . . "04494204-n"^^ . . "electron tube"@en-us . . . "thermionic vacuum tube"@en-us . "electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope"@en-us . "thermionic tube"@en-us . "0"^^ . . . .