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This paper discusses impedance matching between an arbitrary load and a particular type of source network, by means of a lossless two-terminal-pair matching network. The source network consists of an LC ladder in series with a generator resistance. This study is devoted principally to theoretical considerations of low-pass systems utilizing lossless matching networks between source networks and arbitrary load impedances. The present effort is one possible extension of previous work of Fano. Fano's system, however, did not include a two-terminal-pair source network. The value of the present work is derived from an investigation of constraints imposed by the source system and the load, rather than just the load itself.