The Telephone and Its Several Inventors
Lewis Coe
Broschiertes Buch

The Telephone and Its Several Inventors

A History

Versandkostenfrei!
Versandfertig in 1-2 Wochen
35,99 €
inkl. MwSt.
PAYBACK Punkte
18 °P sammeln!
On March 7, 1876, the U.S. Patent Office issued to a young inventor named Alexander Graham Bell what is arguably the most valuable patent ever: entitled ""improvements in telegraphy,"" in truth it secured for Bell the basic principles involved in a telephone. On the same day that Bell filed his patent application, a caveat (a preliminary patent document) was filed by Elisha Gray. This coincidence sparked the first of many debates over whether Bell was the true inventor of the telephone. In the early 1860s Johann Phillipp Reis developed a version of the instrument, but his claims against Bell w...