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2. Quadruplex telegraph - Wikipedia

   en.wikipedia.org/wiki/Quadruplex_telegraph

   Quadruplex telegraphy thus implements a form of multiplexing. The technology was invented by Thomas Edison, who sold the rights to Jay Gould, the owner of the Atlantic and Pacific Telegraph Company, in 1874 for the sum of $30,000 (equivalent to $808,000 in 2023). Edison had previously been turned down by Western Union for the sale of the ...

3. U.S. Military connector specifications - Wikipedia

   en.wikipedia.org/wiki/U.S._Military_connector...

   A MIL-DTL-38999 circular connector plated with a nickel–teflon composite. Left: plug (male) type connector; Right: receptacle (female) type connector) Electrical or fiber-optic connectors used by U.S. Department of Defense were originally developed in the 1930s for severe aeronautical and tactical service applications, and the Type "AN" series set the standard for modern military circular ...

4. Vision Electronic Recording Apparatus - Wikipedia

   en.wikipedia.org/wiki/Vision_Electronic...

   This used 5-centimetre (2.0 in) wide tapes running at a speed of 38 cm (15 in) per second. The rapid tape-to-head speed of quadruplex videotape was achieved by spinning the heads rapidly on a drum: the system used, with variations, on all videotape systems ever since, as well as DAT. The BBC scrapped VERA and quickly adopted the Ampex system.

5. IEC 60320 - Wikipedia

   en.wikipedia.org/wiki/IEC_60320

   A variety of different kinds of IEC 60320 plugs and sockets. IEC 60320 Appliance couplers for household and similar general purposes [1] is a set of standards from the International Electrotechnical Commission (IEC) specifying non-locking connectors for connecting power supply cords to electrical appliances of voltage not exceeding 250 V (a.c.) and rated current not exceeding 16 A. [1 ...

6. Quadruplex - Wikipedia

   en.wikipedia.org/wiki/Quadruplex

   Quadruplex may refer to: Quadruplex (New Orleans), a softball complex in New Orleans City Park; Quadruplex telegraph, an improvement on the electrical telegraph ...

7. VESA Plug and Display - Wikipedia

   en.wikipedia.org/wiki/VESA_Plug_and_Display

   The P&D receptacle and plug are required to bear a standardized symbol to designate the standards with which it is compatible. The upper left quadrant designates analog video support. The upper right quadrant designates digital video support. The lower quadrants designate IEEE 1394 and USB support. [1]: §9.4