This post explains for the TTL 7400.
The Part Number is 7400.
The function of this IC is Quad 2-Input NAND Gate.
Manufacturers : ON Semicondcutor
See the preview image and the PDF file for more information.
This device contains four independent gates each of which performs the logic NAND function. Quad 2-Input NAND Gate.
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Other data sheets within the file : SN74LS00N, SN74LS00D