Please tell me the inventor (or country) and time of the following things.

First of all, the right of invention is often controversial. In fact, when technology advances to a certain extent, the foundation for the birth of a new thing has been laid. It is often that many inventors start to explore an invention at the same time, and the final reputation belongs to only one person, although he may not have achieved this achievement at the earliest, nor made a decisive contribution ... let's say recognized inventors.

Mechanical computer: Pascal France 1642 clock gear computer.

Telegraph: Morse USA 1844

Photography Technology: Daguerre 1838.

(Carl Porter, British inventor, was a pioneer from negative film to positive film. 1835, he began to try out drawings coated with silver chloride or silver nitrate as photosensitive materials, took negative photos in the camera, and then printed them by sunlight. He named his method Carlo photography. After the news of Daguerre's invention of silver disc photography was announced, he raised the issue of invention priority, but it was too late. )

Radio Broadcasting: Fei Sen, USA 1906.

Television: Baird UK 1926

Tel: Bell USA 1876

(Gray independently invented the telephone and fought for the ownership of the invention for more than ten years.)