Mary H. O'Connor | |
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| Born | Mary Hamilton O'Connor September 1, 1872 |
| Died | September 3, 1959 (aged 87) Los Angeles, California, USA |
| Occupation(s) | Screenwriter, film editor |
| Spouse | none |
| Relatives | Loyola O'Connor (sister) |
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Mary H. O'Connor (sometimes credited as Mary Hamilton O'Connor) was an American screenwriter and film editor active during Hollywood's silent era.