Rise of The Demon General - Chapter 361. Getting the Safety Device

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.

Oh Kang-Woo suddenly fell into Hell one day. The only things he had were his desire to live and the Authority of Predation. He devoured hundreds of thousands of demons from the First Hell all the way to the Ninth Hell, and even made the seven princes of Hell bow down to him.

“Why are you trying to go back? You already have everything that you could possibly desire here in Hell.”

“I have everything? Like what?”

There was nothing to eat or enjoy! The only things in Hell were desolate lands and hideous demons!

“I’m going back.”

He finally goes back to Earth after ten grueling millennia.

……………………………………………………………

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Lu Chengye’s dream was to live freely and have fun until he died. Unfortunately, he inherited a company and was worked to the bone!

After finally taking over the company, he had just prepared to begin his carefree life when he was hit by a car and died. His last thoughts were that it would be much better not to be human in the next life.

And so, Lu Chengye was reborn as a Labrador.

- Description from Novelupdates