Articles Index - page 2

Postmaster Generals of the United States
A list of all Postmaster Generals - under the names of those who appointed them and the dates the Postmaster General took office follows.

Alexander Graham Bell's Photophone - Ahead of its Time
Alexander Graham Bell transmitted the first wireless telephone message on his newly-invented photophone.

Where Did Patent Medicine Come From?
The term patent medicine does not necessarily mean the potion is patented.

Sun Energy - Photovoltics and Photovoltaic Systems
Photovoltaic systems convert light energy into electricity.

History of Pagers and Beepers
A pager is a radio frequency device that allows the pager user to receive messages broadcast on a specific frequency.

History of Plasma Television
The very first prototype for a plasma display monitor was invented in 1964.

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