74LS51 series datasheets. Manufacturer: Fairchild Semiconductor.

74LS51 Dual 2-Wide 2-Input, 2-Wide 3-Input AND-OR-INVERT Gate Datasheet*) DM74LS51 Dual 2-Wide 2-Input, 2-Wide 3-Input AND-OR-INVERT Gate Datasheet*) There are other manufacturers for this components. For more information please check 74LS51 (Hitachi Semiconductor)

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