Btw, when we're fiber optic multiplexers invented?

Using of diffractional gratings to mux and demux lights of different colors fall even to 19 century. Fiber optic also used long before networking times, from multifiber flexible image transmitting "cables" to single-fiber applications.

Cellular transmitters?

Transievers of cellular equipment are no different from other transievers. 1G NMT/AMPS and 2G GSM transievers have no specific at all. 2G CDMA / 3G / 4G / 5G transievers was slightly different, due to wide band and channel division technology, but they are no very different from DSSS transievers from late 1940s (yes, it could be hard to accept that digital DSSS is so old, but it is).

every technology is just a refinement or adaptation of previous technology, it is a ladder not a springboard.

No. Back to the laser. There was no any previous device that was somehow similar to the laser at all. There existed separate knowledge of different things that works in laser, but nobody even predicted the properties of laser beams. Same with nuclear reactors, all semiconductor devices, and many other pre-70s inventions and discoveries.

Ladder is what we have now. Only technological improvements, no any new effects, no new principles, nothing. Internal combustion engine in your car use same theory, principles and effects as century ago. All semiconductors "miracle" around is nothing more than miniaturization of pre-70s semiconductor devices. Even in nanometer scale manufacturing process of all that GHz 64bit processors that magnitude orders more powerful than all pre-70s computers nothing new is used.

IDK, if you get the point, but I'm talking about things never existed before. Again with laser - nobody nowhere saw anything like laser beam. And after few scientists mixed some theories, here it is. Same with all other stuff I'm talking about. You will not find anything post-70s that never existed before and come to existence after some scientific work.

I even have an explanation of how that was done - imagine, that some scientists today want to explore some mix of science things that never was explored before. They don't know what they will get eventually (like that laser beam with unusual and unpredicted properties), they even don't know will it work at all. They only suppose that they could find something new and interesting. How do you think, what are their chances to get a grant?

Steam eninges existed since at least Archimedes' time, he made designs for them, yet not until the 18th century did they cause a "breakthrough"

The breakthrough was in using cylinder-piston system to convert steam energy to the movement. Unlike previous designs cylinder-piston system was useable. IIRC it was Huygens at the end of 17 century, who proposed first cylinder-piston design. It was question of only decade when first steam engine that used cylinder-piston design was made and was really useful, unlike that ancient toys.

Btw, when we're fiber optic multiplexers invented?

Using of diffractional gratings to mux and demux lights of different colors fall even to 19 century. Fiber optic also used long before networking times, from multifiber flexible image transmitting "cables" to single-fiber applications.

Cellular transmitters?

Transievers of cellular equipment are no different from other transievers. 1G NMT/AMPS and 2G GSM transievers have no specific at all. 2G CDMA / 3G / 4G / 5G transievers was slightly different, due to wide band and channel division technology, but they are no very different from DSSS transievers from late 1940s (yes, it could be hard to accept that digital DSSS is so old, but it is).

every technology is just a refinement or adaptation of previous technology, it is a ladder not a springboard.

No. Back to the laser. There was no any previous device that was somehow similar to the laser at all. There existed separate knowledge of different things that works in laser, but nobody even predicted the properties of laser beams. Same with nuclear reactors, all semiconductor devices, and many other pre-70s inventions and discoveries.

Ladder is what we have now. Only technological improvements, no any new effects, no new principles, nothing. Internal combustion engine in your car use same theory, principles and effects as century ago. All semiconductors "miracle" around is nothing more than miniaturization of pre-70s semiconductor devices. Even in nanometer scale manufacturing process of all that GHz 64bit processors that magnitude orders more powerful than all pre-70s computers nothing new is used.

IDK, if you get the point, but I'm talking about things never existed before. Again with laser - nobody nowhere saw anything like laser beam. And after few scientists mixed some theories, here it is. Same with all other stuff I'm talking about. You will not find anything post-70s that never existed before and come to existence after some scientific work.

I even have an explanation of how that was done - imagine, that some scientists today want to explore some mix of science things that never was explored before. They don't know what they will get eventually (like that laser beam with unusual and unpredicted properties), they even don't know will it work at all. They only suppose that they could find something new and interesting. How do you think, what are their chances to get a grant?