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1962 Nick Holonyak Jr. develops the first practical visible-spectrum (red) light-emitting diode. 1963 Kurt Schmidt invents the first high pressure sodium-vapor lamp. [17] 1972 M. George Craford invents the first yellow light-emitting diode. 1972 Herbert Paul Maruska and Jacques Pankove create the first violet light-emitting diode.
This was the first formally established electric-lighting company in the United States [5] [6] [7] and was the first company organized specifically to manufacture and sell incandescent electric light bulbs to put into a system. Man and Sawyer patented the first practical electrical distribution system for incandescent electric lighting and gave ...
The Edison Illuminating Company was established by Thomas Edison on December 17, 1880, to construct electrical generating stations, initially in New York City.The company was the prototype for other local illuminating companies that were established in the United States during the 1880s.
This is an incomplete list of television programs formerly or currently broadcast by History Channel/H2/Military History Channel in the United States.
The History Channel's original logo used from January 1, 1995, to February 15, 2008. In the station's early years, the red background was not there, and later it sometimes appeared blue (in documentaries), light green (in biographies), purple (in sitcoms), yellow (in reality shows), or orange (in short form content) instead of red.
The game has changed quite a bit since its inception 51 years ago when the Green Bay Packers won the first-ever NFL championship.
No matter the outcome, this year's game will surely continue the long line of iconic championships.
The war of the currents was a series of events surrounding the introduction of competing electric power transmission systems in the late 1880s and early 1890s. It grew out of two lighting systems developed in the late 1870s and early 1880s; arc lamp street lighting running on high-voltage alternating current (AC), and large-scale low-voltage direct current (DC) indoor incandescent lighting ...