Question

Answer

First generation. Timeframe: Late 1940s to mid-1950s.

Answer

Fourth generation. Timeframe: Mid-1970s to late 1980s.

Answer

Third generation.  Timeframe: Early 1960s to mid-1970s.

Answer

Second generation. Timeframe: Mid-1950s to early 1960s.

Answer

Fifth generation. Timeframe: Late 1980s to present.

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