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1971 • 23 Episodes
Season 1 of Investigation Held by ZnaToKi premiered on February 14, 1971
2002 • 4 Episodes
Season 2 of Investigation Held by ZnaToKi premiered on January 26, 2002
2003 • 6 Episodes
Season 3 of Investigation Held by ZnaToKi premiered on January 1, 2003