Description #2468433

• An electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube

An electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube, 4 letters, 1st letter G
An electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube, 4 letters, 2nd letter R
An electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube, 4 letters, 3rd letter I
An electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube, 4 letters, 4th letter D

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