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{{short description|Type of Morse code operating signal}}
{{distinguish|QR code|Wikidata#Main parts}}
{{redirect|QRO|the airport in Mexico|Querétaro International Airport}} {{engvarB|date=April 2021}}{{use dmy dates|date=May 2023}}
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==Early development==
The original Q-codes were created, ''circa'' 1909, by the British government as a "List of abbreviations ... prepared for the use of British ships and coast stations licensed by the [[Postmaster General of the United Kingdom|Postmaster General]]".<ref>{{cite book |last=Great Britain|first=Post Office|date=October 1909|title=Handbook for wireless telegraph operators working installations licensed by His Majesty's postmaster-general|oclc=40616664|___location=London|publisher=His Majesty's Stationery Office|at=appendix iii}}</ref> The Q-codes facilitated communication between maritime radio operators speaking different languages, so they were soon adopted internationally. A total of forty-five Q-codes appeared in the "List of Abbreviations to be used in Radio Communications", which was included in the Service Regulations affixed to the [[International Radiotelegraph Convention (1912)|Second International Radiotelegraph Convention in London]] (The
The following table reviews a sample of the all-services Q-codes adopted by the 1912 convention:
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