MTL - Not Spare the Years - Chapter 74

The discovery of the so-called dimensional world heralded a new era for humanity.

This world, populated with lifeforms of ever-increasing strength, would soon become known as a treasure trove for those hunters willing to brave its risk.

Soulshards and gene fragments obtained by killing such lifeforms could be assimilated into their bodies, transforming them into genetically enhanced fighters and setting the stage for the age of genetic enhancement.Zhang Lie, a seasoned fighter who had once explored the fourth of the five known realms of the dimensional world, finds himself thrown back into his youth, to the initial heyday of exploration and growth, before the secrets of this new world had been mined and revealed to all.

Armed with foreknowledge, Zhang Lie will blaze a path for humanity to the stars—and beyond.

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A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

The notorious firearms crime lord Chen Zhang An a.k.a Old Fox was placed under house arrest by the very successor he groomed.

It has been more than ten years since he was transported to another world. The protagonist Deris Fahrenheit, who has became a magician with special circumstances, was freely enjoying his life in this world. However, a girl appeared before him and asked him to make her his disciple. That girl seems to be a transported person――

It’s a story of him who becomes the girl’s teacher and trains her to achieve her revenge (?) in otherworld.