SN7440N TTL Dual 4 Input NAND Buffer - 7440 DM7440 - NOS

7440 TTL Dual 4 Input NAND Buffer - NOS

6pcs Signetics N7440AH Dual 4-Input NAND Buffer Positive Logic TTL 5V DIP-14

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Vintage Signetics N7420A Dual 4-Input Positive NAND Gate 14-Pin IC Chip IC @IC8

9PCS SN7440N TI Dual 4-Input NAND Buffer Positive Logic TTL 5V DIP-14

7400N Signetics NAND Gate 2-Input TTL PDIP14 IC

N7451A Signetics AND-OR-Invert Gate TTL Series 2-Func 4-Input APPLE 1 NOS