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The first version produced for commercial sale by Colt was the SP1 model AR-15 Sporter in .223 Remington, with a 20-inch (51 cm) barrel and issued with five-round magazines. [21] Initial sales of the Colt AR-15 were slow, primarily due to its fixed sights and carry handle that made scopes difficult to mount and awkward to use. [ 84 ]
The Anderson EA-1 Kingfisher is a US two-seat amphibious aircraft designed and marketed for homebuilding. [1] It was the work of Earl William Anderson, a Pan Am airline captain, who flew the prototype on 24 April 1969. By 1978, 200 sets of kits for the plane had been sold, and 100 Kingfishers were reported to be under construction.
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The AN/URM-25 was part of a series of vacuum tube-based signal generators built for the U.S. military in the early Cold War-era.. Today they are collected and used by vintage amateur radio and antique radio enthusiasts who say they provide reasonably high accuracy and stability for a low cost, with build quality reflecting tough military construction requirements and standards.
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The Anderson Greenwood AG-14 is a two-seat utility aircraft developed in the United States shortly after World War II. It is an all-metal, shoulder-wing monoplane of pod-and- boom configuration, equipped with a pusher propeller , side-by-side seating and fixed tricycle undercarriage .
A valve RF amplifier (UK and Aus.) or tube amplifier is a device for electrically amplifying the power of an electrical radio frequency signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers during the 1960s and 1970s, initially for receivers and low power stages of ...
Andersen Air Force Base was established on 3 December 1944, and is named for Brigadier General James Roy Andersen (1904–1945). Andersen graduated from the United States Military Academy in 1926, served at various army installations, and obtained his wings at Kelly Field, Texas, in 1936.