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Organized broadcasting began in the U.S. in the early 1920s on the AM band — FM and television did not exist yet. Initially most broadcasting stations were assigned three-letter calls; however, a switch was made in April 1922 to primarily four-letter calls, after the number of stations had increased into the hundreds.
In Mexico, AM radio stations use XE call signs (such as XEW-AM), while the majority of FM radio and television stations use XH. Broadcast callsigns are normally four or five letters in length, plus the -FM or -TV suffix where applicable, though several older stations have only three letters. The longest callsign is six letters, plus suffix ...
Locatable Address Conversion System (LACS) is a service offered by the United States Postal Service to update mailing addresses when a street is renamed or the address is updated for 911. In the case of 911, the address is changed from a rural route format to an urban/city route format.
"The United States Postal Service receives tens of millions of address change requests annually; 43.8 million were processed in 2009," says Sue Brennan of the U.S. Postal Service, "and while the ...
Canadian broadcast stations are assigned a three-, four-, or five-letter base call sign (not including the "-FM", "-TV" or "-DT" suffix) beginning with CB, CF, CH, CI, CJ, CK, VF, or VO. The "CB" series calls are assigned to Chile by the ITU, but Canada makes de facto use of this series anyway for stations belonging to, but not exclusively ...
In these cases, exact and unambiguous communication of time is critical. If someone mistakes 5:00 AM for 5:00 PM in a hospital for example, when medication or other medical treatment is needed at a certain time, the outcome could be dire. Thus 24-hour time (5:00 PM written as 17:00) is used.
It’s been more than 22 years since 9/11 and more than 12 since Osama bin Laden’s death. But the al-Qaida leader’s open “Letter to America” attempting to justify the Sept. 11, 2001 ...
According to Change Healthcare, letters notifying business customers of the breach started being sent out back in June but New Yorkers have been receiving them as recently as September and October.