I Signed a Contract with an Intelligent Brain from Five Billion Years Ago

Industrial Literature, Engaged in Industry in Modern Times

I like those who value industry and have black technology! Don't mess with your phone or anything like that, you're tired of it

Heavy Industry Builds Cars and Airplanes

The protagonist was reborn in 2005. His family had a motorcycle parts factory. Before his rebirth, Pigfoot was a mercenary scientist who specialized in building airplanes. It was closed down some time ago.

Chronicles: a Technologically Powerful Nation Does Not Want the Love of Children

Is there any book about modern people who travel back in time and then use modern technology to protect their families and the country? It can be from either the male or female protagonist's perspective, with or without vests. It doesn't have to be about love between children, but it's about serving the country and being favored by the country! !

Are There Any Rebirth Time Travel Stories That Have Been Pursuing Official Careers Since the 1950S and 1960S?