secondary triangulation
51Aircraft emergency frequency — The aircraft emergency frequency (also known as guard) is a frequency used on the aircraft radio band reserved for emergency communications for aircraft in distress. The frequencies are 121.5 MHz for civilian, also known as International Air… …
52Tachikoma — A Tachikoma (タチコマ) is a fictional AI walker/roller tankette in the Ghost in the Shell universe, appearing in the manga created by Masamune Shirow and the sub universe. Nine of them are assigned to Section 9 s use originally [Official Log, page 28 …
53Royal Observer Corps — Ensign Active 1925–1996 Country …
54Telecommunications data retention — In the field of telecommunications, data retention (or data preservation) generally refers to the storage of call detail records (CDRs) of telephony and internet traffic and transaction data (IPDRs) by governments and commercial organisations. In …
55United Kingdom Warning and Monitoring Organisation — The United Kingdom Warning and Monitoring Organisation (UKWMO) was a British civilian organisation operating between 1957 and 1992 to provide the authorities with data about nuclear explosions and forecasts of likely fallout profiles across the… …
56History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… …
57Urban search and rescue — also known as USAR, or Urban SAR [In the US due to legal issues involving potential confusion with the United States Army Reserve] involves the location, extrication, and initial medical stabilization of victims trapped in confined spaces.… …
58Denial of the Armenian Genocide — is the assertion that the Armenian Genocide did not occur in the manner or to the extent described by scholarship. The Armenian Genocide is widely acknowledged outside Turkey to have been one of the first modern, systematic genocides, [Ferguson,… …
59Inventions in medieval Islam — A significant number of inventions were developed in the medieval Islamic world, a geopolitical region that has at various times extended from Al Andalus and Africa in the west to the Indian subcontinent and Malay Archipelago in the east.… …
60Dependovirus — Virus classification Group: Group II (ssDNA) Kingdom: Viruses Family: Parvoviridae …
