1. Did you ever have a chance to read my paper on thermionic transconductance?

2. These designs include thermionic converter, thermophotovoltaic cells, alkali-metal thermal to electric converter, and the most common design, the radioisotope thermoelectric generator.

3. Relays and vacuum tubes (thermionic tubes) were commonly used as switching elements; a useful computer requires thousands or tens of thousands of switching devices.

4. The first vacuum tube used in radio was the thermionic diode or Fleming valve, invented by John Ambrose Fleming in 1904 as a detector for radio receivers.

5. Space-based nuclear power sources can be used aboard spacecraft as a source of heat in systems with a direct (for example, thermoelectric and thermionic) or dynamic (for example, Rankine and Brayton cycles) conversion of thermal energy into electric power.

6. Holograms, lasers not for medical purposes, optical readers, projector screens, video display screens, sound recording strips and apparatus, record players, acoustic couplers, needles for record players, loudspeakers, amplifiers, thermionic valves (radio), musical juke boxes, tone arms for record players, cabinets for loudspeakers, headphones (music), video cassettes, magnetic tapes, diaphragms (acoustic)

7. 41/ 00 Discharge tubes and means integral therewith for measuring gas pressure (vacuum gauge systems using such tubes G 01 L 21/30); Discharge tubes for evacuation by diffusion of ions 41/ 02 . Discharge tubes and means integral therewith for measuring gas pressure [2] 41/ 04 . . with ionisation by means of thermionic cathodes [2] 41/ 06 . . with ionisation by means of cold cathodes [2] 41/ 08 . . with ionisation by means of radioactive substances, e.g. alphatrons [2] 41/ 10 . . of particle-spectrometer type (particle spectrometers in general H 01 J 49/00) [2] 41/ 12 . Discharge tubes for evacuating by diffusion of ions, e.g. ion pumps, getter ion pumps [2] 41/ 14 . . with ionisation by means of thermionic cathodes [2] 41/ 16 . . . using gettering substances [2] 41/ 18 . . with ionisation by means of cold cathodes [2] 41/ 20 . . . using gettering substances [2]