 1973 Recombinant DNA

1973 Catalytic converter (three-way)

1973 Mobile phone

A mobile phone, or cell phone, is a long-range, electronic device used for mobile voice or data communication over a network of specialized base stations known as cell sites.Early mobile FM radio telephones were in use for many years, but since the number of radio frequencies were very limited in any area, the number of phone calls were also very limited.To solve this problem, there could be many small areas called cells which share the same frequencies.