My legendary class is Husband Of Deathwill Sisters?! - Chapter 50

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.

A boy wakes up with omnitrix as a X-GENE

It’s the vacation of a lifetime, a trip to a remote island filled with geniuses and murder.

Li Xiaonian dies as a result of his girlfriend’s betrayal. Luckily, he has the chance to start all over again and is reborn with a mysterious space battleship he accidentally acquired in his previous life—”Shadow”.

Returning to the virtual online game “Star Wind’ that everyone is crazy about, he finds himself to be a little different in this life. The gift “Shadow” bestowed on him this time turns out to be Memory Instillation. With this gift, it only takes him a moment to master any kind of skill.

Ding… System: You’ve acquired primary shooting skills and gained 10 years of shooting experience.

System: you’ve acquired mechanical modification technology and gained 10 years of mechanical assembly experience.

Playing the game, unconsciously, Li Xiaonian has become a zillionaire and a man of great wisdom in the real world.

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