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2. Garage door opener - Wikipedia

   en.wikipedia.org/wiki/Garage_door_opener

   The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.

3. Chamberlain Group - Wikipedia

   en.wikipedia.org/wiki/Chamberlain_Group

   Chamberlain, LiftMaster, and Craftsman have interchangeable parts, primarily the gear and circuit boards. The greatest difference between the brands is that Chamberlain and Craftsman operate on a square shaped split-rail system, while LiftMaster consists of one single solid piece of inverted t-shaped rail.

4. Output signal switching device - Wikipedia

   en.wikipedia.org/wiki/Output_Signal_Switching_Device

   An output signal switching device (OSSD) is an electronic device used as part of the safety system of a machine. It provides a coded signal which, when interrupted due to a safety event, signals the machine to shut down. It works by converting the standard direct current supply, usually 24 volts, into two pulsed and out-of-phase signals.

5. Sliding door operator - Wikipedia

   en.wikipedia.org/wiki/Sliding_door_operator

   The simplest sensor consists of a light beam aimed across the opening: when the beam is broken by an obstacle, the operator prevents the door from closing. Infrared and radar safety sensors are also commonly used. Other sensors such as resistance-sensing motors can be used to reverse the closing action of the door after an obstacle is encountered.

6. List of accidents and incidents involving the Douglas DC-6

   en.wikipedia.org/wiki/List_of_accidents_and...

   Douglas DC-6B of Swiss airline Balair in 1976. The Douglas DC-6 is a piston-powered airliner and transport aircraft built by the Douglas Aircraft Company from 1946 to 1958. . Originally intended as a military transport near the end of World War II, it was reworked after the war to compete with the Lockheed Constellation in the long-range commercial transport

7. 3 ways to minimize your own risk of falling like Pelosi and ...

   www.aol.com/3-ways-minimize-own-risk-130041920.html

   It is essential older people wear appropriate footwear to reduce their fall risk. Footwear should fit properly and have non-skid, or non-slip, soles. This includes shoes and sneakers, but also ...