New logic symbols

In the late 1960s, the International Electrotechnical Committee, IEC, set up a working group to devise symbols for binary logic. The work of this groupe culminated in the early 1980s in IEC Publication 617: Graphical Symbols for Diagrams. Part 12: Binary Logic Elements. This standard, published in 1983, went into general circulation in early 1984. lt takes into account the use of computer-aided drafting equipment and all symbols are designed on a grid.