These devices are transistor-transistor logic dual JK master-slave flip-flops in the FJ series of integrated circuits. The FJJ121 corresponds to ’74 Series’ type 7473N, the FJJ126 corresponds to ’64 Series’ type 6473N.
Manufactured: 1972 week 07
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- FJJ121A (1), manufactured 1972 week 7
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- FJJ121A (2), manufactured 1971 week 25