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n4http://dbpedia.org/resource/Network_analyzer_(electrical)
n2http://dbpedia.org/resource/Network_analyzer_(AC_power)
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From 1929 to the late 1960s, large alternating current power systems were modelled and studied on AC network analyzers (also called alternating current network calculators or AC calculating boards) or transient network analyzers. These special-purpose analog computers were an outgrowth of the DC calculating boards used in the very earliest power system analysis. By the middle of the 1950s, fifty network analyzers were in operation.
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