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The London Underground map was designed by Harry Beck and introduced in 1933. He received only 5 guineas for his efforts.
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Among the four circuit elements, the first three are two-poles. This list is exhaustive. The transformation element is a four-pole. There are other lossless four-poles which one might have chosen in addition, e.g., the ideal gyrator.
[8]
An exception to this rule may occur when the mechanical device embodies one or more floating levers, as we just learned.
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