In which decade was the SPICE simulator introduced?

In which decade was the SPICE simulator introduced?

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1) '.TXT' extension refers usually to what kind of file?

2) What does the term PLC stand for?

3) Who is largely responsible for breaking the German Enigma codes, created a test that provided a foundation for artificial intelligence?

4) In which decade with the first transatlantic radio broadcast occur?

5) In which decade was the American Institute of Electrical Engineers (AIEE) founded?