thermionic tube
(also called thermionic vacuum tube or thermionic valve) Thermionics (an electron tube in which electron emission is produced by the heating of an electrode) तापआयनिक नलिका
(also called thermionic vacuum tube or thermionic valve) Thermionics (an electron tube in which electron emission is produced by the heating of an electrode) तापआयनिक नलिका
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