| Conrad K. Cyr | 
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| In office January 31, 1997 – July 28, 2016
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| In office November 20, 1989 – January 31, 1997
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| Appointed by | George H. W. Bush | 
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| Preceded by | Frank M. Coffin | 
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| Succeeded by | Kermit Lipez | 
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| In office May 19, 1987 – November 20, 1989
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| Appointed by | William Rehnquist | 
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| Preceded by | William Clark O'Kelley | 
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| Succeeded by | Frank Harlan Freedman | 
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| In office 1983–1989
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| Preceded by | Edward Thaxter Gignoux | 
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| Succeeded by | Gene Carter | 
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| In office September 28, 1981 – November 20, 1989
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| Appointed by | Ronald Reagan | 
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| Preceded by | George J. Mitchell | 
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| Succeeded by | D. Brock Hornby | 
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| Born | (1931-12-09)December 9, 1931 Limestone, Maine, U.S.
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| Died | July 28, 2016(2016-07-28) (aged 84) Hampton, New Hampshire, U.S.
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| Education | College of the Holy Cross (BS) Yale University (LLB)
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Conrad Keefe Cyr (December 9, 1931 – July 28, 2016) was an American jurist who served as a United States circuit judge of the United States Court of Appeals for the First Circuit from 1989 until his death. He was previously a United States district judge of the United States District Court for the District of Maine.