the purpose of communication . in modern times, this process almost always involves the use of electromagnetic waves by transmitters and receivers, but in earlier years it also involved the use of drums and visual signals such as smoke , fire , beacons , semaphore lines and other optical communications...
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and televisionbroadcasting and wireless communications equipment manufacturing other communications equipment manufacturing search, detection, navigation, guidance, aeronautical, and nautical system and instrument manufacturing automatic environmental control manufacturing for residential, commercial...
for semiconductor material doping :magnetic coupling, clutch and brake :electromagnetiic lifting heads :electric ignition device :electroplating, electrolysis or electrophoresis equipment :electric heater :electric heater and oven :graphite products for electrical equipment :generator :cable made from...
frequency interface (rfi) (fcc ) this device has been tested and found to comply with the limits for class b digital devices pursuant to part subpart b, of the fcc rules. these limits are designed to provide reasonable protection against harmful interference in a residential environment. this equipment...
of educational television , which hindered struggling abc and dumont 's quest for affiliates in the more desirable markets where vhf channels were reserved for non-commercial use. the sixth report and order also provided for the "intermixture" of vhf and uhf channels in most markets; uhf transmitters...
the british broadcasting corporation ( bbc ), which is perhaps most well known for its news agency bbc news . owned by the crown , the bbc operates primarily in the united kingdom . it is funded by the television licence paid by british residents that watch terrestrial television and as a result, no...
cumulus media networks) was sold to citadel broadcasting , abc has reduced its broadcasting operations almost exclusively to television. it is the fifth-oldest major broadcasting network in the world and the youngest of the american big three television networks . abc is nicknamed "the alphabet network...
media centre the bbc is the world's leading public service broadcaster we're impartial and independent, and every day we create distinctive, world-class programmes and content which inform, educate and entertain millions of people in the uk and around the world. we do this across: a portfolio of television...