These devices are transistor-transistor logic quadruple 2-input NAND gates in the FJ series of integrated circuits. The FHJ131 corresponds to ’74 Series’ type 7400N, the FHJ136 corresponds to ’64 Series’ type 6400N.
Manufactured (1): 1974 week 3
Manufactured (2): 1971 week 52
Manufactured (4): 1972 week 3
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- FJH131A (1), manufactured 1974 week 3
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- FJH131A (2), manufactured 1971 week 52
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- FJH131 (3), date of manufacture unknown
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- FJH131 (4), manufactured 1972 week 3
