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2. Trapped-key interlocking - Wikipedia

   en.wikipedia.org/wiki/Trapped-key_interlocking

   For example, to prevent access to the inside of an electric kiln while it is operating, a trapped-key system may be used to interlock a disconnecting switch and the kiln door. Whenever the kiln power switch is turned on, the key is automatically held by the interlock, and cannot be manually removed. In order to open the kiln door, the power ...

3. Child safety lock - Wikipedia

   en.wikipedia.org/wiki/Child_safety_lock

   [4] The lock is typically engaged via a small switch on the edge of the door that is only accessible when the door is open. Some cars [5] implement the child lock control as a rotary mechanism which can only be operated with a key. This design ensures the child lock remains in position, preventing passengers from changing the lock position when ...

4. Electric eye - Wikipedia

   en.wikipedia.org/wiki/Electric_eye

   Electric eye for a garage door opener. An electric eye is a photodetector used for detecting obstruction of a light beam. An example is the door safety system used on garage door openers that use a light transmitter and receiver at the bottom of the door to prevent closing if there is any obstruction in the way that breaks the light beam.

5. Manual fire alarm activation - Wikipedia

   en.wikipedia.org/wiki/Manual_fire_alarm_activation

   System tests could be conducted in one of two ways: In a coded pull station, there is either a test hole on the front (usually activated with an Allen wrench) or a test switch on the inside. Turning the switch one way causes the notification appliances to sound continuous (or in the case of single-stroke bells, ding once). Turning it the other ...

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

7. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   Two light switches in one box. The switch on the right is a dimmer switch. The switch box is covered by a decorative plate. The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. [1]

8. AOL Mail

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. AOL Mail for Verizon Customers - AOL Help

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   AOL Mail welcomes Verizon customers to our safe and delightful email experience!