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Post-1960 2000-type director unit comprising BC selector and translation field

Post-1960 2000-type director unit comprising BC selector and translation field

1960-1991
Post-1960 2000-type director unit comprising called number storage uniselectors, control uniselector, sending uniselector and relay set

Post-1960 2000-type director unit comprising called number storage uniselectors

1960-1991