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2. Radio-paging code No. 1 - Wikipedia

   en.wikipedia.org/wiki/Radio-paging_code_No._1

   An NEC pager, using POCSAG coding branded for the Skyper network. Radio-paging code No. 1 (usually and hereafter called POCSAG) is an asynchronous protocol used to transmit data to pagers. Its usual designation is an acronym of the P ost O ffice C ode S tandardisation A dvisory G roup, the name of the group that developed the code under the ...

3. Pager - Wikipedia

   en.wikipedia.org/wiki/Pager

   Pager. A pager, also known as a beeper or bleeper, [1] is a wireless telecommunications device that receives and displays alphanumeric or voice messages. One-way pagers can only receive messages, while response pagers and two-way pagers can also acknowledge, reply to, and originate messages using an internal transmitter. [2]

4. History of the roller coaster - Wikipedia

   en.wikipedia.org/wiki/History_of_the_roller_coaster

   Roller coaster amusement rides have origins back to ice slides constructed in 18th-century Russia. Early technology featured sleds or wheeled carts that were sent down hills of snow reinforced by wooden supports. The technology evolved in the 19th century to feature railroad track using wheeled cars that were securely locked to the track.

5. Hypercoaster - Wikipedia

   en.wikipedia.org/wiki/Hypercoaster

   A hypercoaster is a roller coaster with a height or drop measuring at least 200 feet (61 m). [1] [2] The term was first coined by Arrow Dynamics and Cedar Point in 1989 with the opening of the world's first hypercoaster, Magnum XL-200, which features a height of 205 feet (62 meters). The next hypercoaster, Pepsi Max Big One, opened five years ...

6. Skyplex - Wikipedia

   en.wikipedia.org/wiki/Skyplex

   Skyplex was a planned entertainment complex, [1] It was to be located on a 14-acre (5.7 ha) lot at the northeast corner of Sand Lake Road and International Drive in Orlando, Florida. Plans for the complex were to include a 570-foot (170 m) tower which would’ve featured the world's tallest roller coaster, Skyscraper, and the world's largest ...

7. Sampoong Department Store collapse - Wikipedia

   en.wikipedia.org/wiki/Sampoong_Department_Store...

   The fifth-story restaurant floor had a heated concrete base referred to as ondol, which has hot water pipes going through it; the presence of the 1.2-metre-thick (4 ft) ondol greatly increased the weight and thickness of the slab. The store's three 15-tonne air conditioning units were installed on the roof leading to a greater structural strain ...