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I believe '88-'89 was the permanent switch to 3-man.
The NBA also used 3-man officiating for one year in 1978-79, but tossed it after that year. It was a strange experiment where the 3rd official was limited to only making certain calls. I don't believe there was any rotation or switching with the 3rd official - he was in one spot on the court the entire game. I wish I could remember what he was allowed to call, but I can't. I'll look for it.
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