Road to becoming the wealthiest: Starting From Treasure Hunting in the Cabinets - Chapter 445 - 318: In the End, There’s Still a Leak_2

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.

Hoo hoo hoo, the Director has fallen! (crying)Don't... don't rush to call an ambulance, just help me up first!After staying up late playing games, Fang Ye woke up to find himself transformed into the director of a rundown zoo, having a docile and perceptive Amur tiger, a ferocious and haughty silver fox, a gray wolf that enjoyed showing off its relationship...As the zoo developed, its array of charming animals began to attract visitors from all over the world.“Why do all the animals like me?” Faced with the curious questioning of children, Fang Ye looked up at a 45-degree angle into the sky, speaking in a tone that was deep and mysterious, “It all started on a breezy and sunny evening...”

Hiding in the Cold Palace and eventually becoming a Boss of Sorts. Li Mu was transported to a fantastical world and became a measly eunuch of the State of Xia. Despite having initially thought that his life would be a miserable one, he had unexpectedly acquired a check-in system.

Getting the [Boosted Gear] is expected for Issei. What if he gained it a month early and another one as well? Let the Games Begin... IsseiXHarem (if it wasn't, it wouldn't be DXD). Now has a TVTropes page! Getting the [Boosted Gear] is expected for Issei. What if he gained it a month early and another one as well? Let the Games Begin... IsseiXHarem (if it wasn't, it wouldn't be DXD). Now has a TVTropes page!