The Integrated Circuit 7402 is a Quad Dual Input NOR gate in a 14-Pin Package (DIL / SMD)
Similiar Devices / Second Source
74F02
74ALS02
74LS02
74HC02
74HCT02
74LVX02

Here you may find Schematic Diagram for DIY, Datasheet, Pinout as well as further Information on the Integrated Circuit 7402

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