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2. Electric gate - Wikipedia

   en.wikipedia.org/wiki/Electric_gate

   At the end of the 19th century, electric gates were also used at horse racing tracks. [5] The first commercial electric gate systems were hydraulic and designed for reliability and ease of use. The cost of the hydraulic systems however meant that other companies started producing more affordable electromechanical alternatives.

3. Logic gate - Wikipedia

   en.wikipedia.org/wiki/Logic_gate

   The IEC standard, IEC 60617-12, has been adopted by other standards, such as EN 60617-12:1999 in Europe, BS EN 60617-12:1999 in the United Kingdom, and DIN EN 60617-12:1998 in Germany. The mutual goal of IEEE Std 91-1984 and IEC 617-12 was to provide a uniform method of describing the complex logic functions of digital circuits with schematic ...

4. Electrical wiring in the United Kingdom - Wikipedia

   en.wikipedia.org/wiki/Electrical_wiring_in_the...

   Electrical wiring is ultimately regulated to ensure safety of operation, by such as the building regulations, currently legislated as the Building Regulations 2010, which lists "controlled services" such as electric wiring that must follow specific directions and standards, and the Electricity at Work Regulations 1989.

5. List of 4000-series integrated circuits - Wikipedia

   en.wikipedia.org/wiki/List_of_4000-series...

   The following is a list of CMOS 4000-series digital logic integrated circuits.In 1968, the original 4000-series was introduced by RCA.Although more recent parts are considerably faster, the 4000 devices operate over a wide power supply range (3V to 18V recommended range for "B" series) and are well suited to unregulated battery powered applications and interfacing with sensitive analogue ...

6. Bar gate - Wikipedia

   en.wikipedia.org/wiki/Bar_gate

   Some bar gates are automatic and powered; others are manually operated. Manual gates are sometimes hung in the manner of a normal gate (i.e. hinged horizontally). In some places, bar gates are installed across suburban streets as a traffic calming measure, preventing through traffic, while allowing authorised vehicles such as emergency services ...

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   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.