Telephone And Its Several Inventors : A History

sku: COM9780786426096NEW
ACCORDING TO OUR RECORDS THIS PRODUCT IS NOT AVAILABLE NOW
$38.81
Shipping from: Canada
Description
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 were hampered by the bungling of his lawyers in demonstrating his instrument in court. This work is a first look at the many men who developed the telephone and an examination of their claims against Bell’s patent. A lay description of the phone is also provided, as well as a history of the development of the telephone system.
Price history chart & currency exchange rate
Customers also viewed

$33.66
Volkswagen Passat B4 Перемычки на рейлинги без ключа Черный / Багажник Фольксваген Пассат Б4
prom.ua
$16.34
Детская зимняя куртка-парка унисекс синтепон + овчина 1021 "Philipp Plein" в расцветках
prom.ua
$8.68
Осветляющее и увлажняющее трио, три крема, Brightening & Hydrating Trio, Derma E, набор из 3 предметов, 1/2
prom.ua
$3.61
Прозрачный силиконовый чехол с глянцевой окантовкой Full Camera для Samsung Galaxy S21, Зеленый
prom.ua
$44.77
Мужские кроссовки Nike Air Max 95 Sneakerboot Grey / Найк Аир Макс 95 Сникербут Серые 45, Серый
prom.ua
$45.98
Женские кроссовки Nike Air Force 1 Type Black White / Найк Аир Форс 1 Type Черные Белые 40, Черный
prom.ua
$30.27
Энергоаккумулятор тормозной 9254911410 Тип 24/24 D/P барабан M22x1.5 капсульный, внутренний переток M22x1,5
prom.ua