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200 1 $a<<The >>design of switching circuits$fby William Keister, Alistair E. Ritchie, Seth H. Washburn
210   $aNew Jersey$cVan Nostrand$dc1951
215   $a556 p.$cill.$d24 cm
225 1 $aBell telephone laboratories series
610 0 $aCircuiti di commutazione
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701  1$aWashburn,$bSeth H.$0294934
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