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The pagers bleeped, then paused, then detonated, giving time for victims to bring pagers to their face to read an expected message. [5] Twenty people were killed and about 2,800 injured, two-thirds of whom required surgery to face, eyes or hands, with many amputations. [ 6 ]
Satellite phone systems can be classified into two types: systems that use satellites in a high geostationary orbit, 35,786 kilometres (22,236 mi) above the Earth's surface, and systems that use satellites in low Earth orbit (LEO), 640 to 1,120 kilometers (400 to 700 miles) above the Earth.
These two-way pager models had thumb keyboards, with a thumbwheel for scrolling its monochrome text display. The first model, the Inter@ctive Pager , was announced on September 18, 1996. [ 1 ] Within a year, Yankee Group was estimating that devices like the Inter@ctive Pager were in use by fewer than 400,000 people and expected two-way wireless ...
RAMfirst Interactive Paging logo. The Inter@ctive Pager is a discontinued two-way pager released in 1996 by Research In Motion (later known for the BlackBerry line of smartphones) that allowed users to receive and send messages via the Mobitex wireless network.
Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver ...
A walkie-talkie, more formally known as a handheld transceiver (HT) or handheld radio, is a hand-held, portable, two-way radio transceiver. Its development during the Second World War has been variously credited to Donald Hings, radio engineer Alfred J. Gross, Henryk Magnuski and engineering teams at Motorola. First used for infantry, similar ...
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