Who Invented What

Petrache Poenaru. Many think it’s L.E Waterman. But Petrache Poenaru, received a patent from the French government May 25, 1827

While at Motorola in the 1970s, Cooper invented the first handheld cellular mobile phone in 1973

Otto invented the first four-stroke internal-combustion engine in 1876. He called it the 'Otto Cycle Engine.