Tungsten filament

The invention: 

Metal filament used in the incandescent light bulbs
that have long provided most of the world’s electrical lighting.


The people behind the invention:

William David Coolidge (1873-1975), an American electrical
engineer
Thomas Alva Edison (1847-1931), an American inventor

Tuberculosis vaccine

The invention: 

Vaccine that uses an avirulent (nondisease) strain
of bovine tuberculosis bacilli that is safer than earlier vaccines.


The people behind the invention:

Albert Calmette (1863-1933), a French microbiologist
Camille Guérin (1872-1961), a French veterinarian and
microbiologist
Robert Koch (1843-1910), a German physician and
microbiologist

Transistor radio

The invention:

 Miniature portable radio that used transistors and
created a new mass market for electronic products.