Quote - GPS. And relativity is important in communications using satellites due to the fact that satellites are travelling at a significant fraction of the speed of light.

Significant fraction ??? How much is the speed of light and how much is the speed of Earth ?

How do you know that GPS are really using Relativity ? Much better, how do you know that the GPS products that are sold use satellites and not cell phone towers ?

Quote - The design of cathodic tubes for TV must take in account relativistic mass increase due to the electrons travelling at a very considerable speed.

Realtivity is noy used, nobody designs a cathode ray tube using Relativity and the cathode ray tube was, invented, designed and used well before Relativity was accepted by all the world and this happened only after WWII.

Quote - The same is true for the design of free-electron lasers.There are probably many others that I don't know just now.

Electron lasers???? This much be something very new, I never heard before and I am unable to imagine what it can be.

Quote - And there is something that you should know about electronics. You have to take in account quantum mechanics to design computer circuits, right? Then, you should know that the Dirac equation, one of the fundamental equations of quantum mechanics, incorporates relativity.

All Qunatics Physics used by Electronics is based on non-Relativistics Quantics. It is based on Schoedinger wave equation, Bohr, Pauli and Heisenberg work.

Dirac's Relativistic Quantics is never used in any electronic creation and no Electronic enginner studies Dirac*.* It has no use.*

Stupidity also evolves!