Touch-tone telephone

The invention: 

A push-button dialing system for telephones that
replaced the earlier rotary-dial phone.

The person behind the invention:

Bell Labs, the research and development arm of the American
Telephone and Telegraph Company

Tidal power plant

The invention:

Plant that converts the natural ocean tidal forces
into electrical power.

The people behind the invention:

Mariano di Jacopo detto Taccola (Mariano of Siena, 1381-1453),
an Italian notary, artist, and engineer
Bernard Forest de Bélidor (1697 or 1698-1761), a French engineer
Franklin D. Roosevelt (1882-1945), president of the United States

Thermal cracking process

The invention: 

Process that increased the yield of refined gasoline
extracted from raw petroleum by using heat to convert complex
hydrocarbons into simpler gasoline hydrocarbons, thereby making
possible the development of the modern petroleum industry.

The people behind the invention:

William M. Burton (1865-1954), an American chemist
Robert E. Humphreys (1942- ), an American chemist