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2. Doorbell - Wikipedia

   en.wikipedia.org/wiki/Doorbell

   Doorbell mechanism from 1884 in Andrássy Avenue, Budapest Antique mechanically operated shop doorbell on a torsion spring. William Murdoch, a Scottish inventor, installed a number of his own innovations in his house, built in Birmingham in 1817; one of these was a loud doorbell, that worked using a piped system of compressed air. [1]

3. Orbitron - Wikipedia

   en.wikipedia.org/wiki/Orbitron

   [2] [3] One of a series of ordinary doorbell push-button switches atop the hood activated the top from the outside. Other mechanical features included a 1956 Chevrolet rear end, dropped Ford front beam axle, Buick brake drums and early Ford brakes. The frame was handmade of rectangular 2x4 inch steel tubing.

4. Electric bell - Wikipedia

   en.wikipedia.org/wiki/Electric_bell

   Older electric doorbell. An electric bell is a mechanical or electronic bell that functions by means of an electromagnet.When an electric current is applied, it produces a repetitive buzzing, clanging or ringing sound.

5. Things Boomers Took for Granted That are Obsolete Now

   www.aol.com/things-boomers-took-granted-obsolete...

   Although Bell developed a primitive version in 1950, it took until 1975 for push button phones to make an impact. Tone-enabled features like call waiting and three-way calling signalled the ...

6. Push switch - Wikipedia

   en.wikipedia.org/wiki/Push_switch

   A push switch (button) is a momentary or non-latching switch which causes a temporary change in the state of an electrical circuit only while the switch is physically actuated. An automatic mechanism (i.e. a spring ) returns the switch to its default position immediately afterwards, restoring the initial circuit condition.

7. How to Stop a Dog From Barking, According to an Expert Trainer

   www.aol.com/stop-dog-barking-according-expert...

   Training your dog to go to his mat upon hearing the doorbell gives him the opportunity to practice an alternate, more desirable behavior, which pays off with some treats and your attention. Photo ...