4001
Quad 2-input NOR gates.

    +----------+             +-----------+           ___
 1A |1  +--+ 14| VCC         | A | B |/Y |      /Y = A+B
 1B |2       13| 4B          |---+---+---|
/1Y |3       12| 4A          | 0 | 0 | 1 |
/2Y |4  4001 11| /4Y         | 0 | 1 | 0 |
 2A |5       10| /3Y         | 1 | 0 | 0 |
 2B |6        9| 3B          | 1 | 1 | 0 |
GND |7        8| 3A          +-----------+
    +----------+

[This information is part of the GIICM]