 |
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| Friday, April 13th , 1888 |
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| Signed free agent SS Ray Warren to a minor league contract with a major league option. |
| Friday, April 6th , 1888 |
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| Signed free agent LF Jack Evans to a 1-year contract worth a total of $242. |
| Wednesday, April 4th , 1888 |
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| Signed free agent SS Guy Bullock to a minor league contract with a major league option. |
| Monday, April 2nd , 1888 |
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| Signed free agent LF Joe Current to a minor league contract with a major league option. |
| Sunday, April 1st , 1888 |
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| Signed free agent LF Dave Fox to a minor league contract with a major league option. |
| Wednesday, March 28th , 1888 |
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| Signed free agent LF Clipper Smith to a 1-year contract worth a total of $298. |
| Friday, March 9th , 1888 |
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| Signed free agent CF Dave Crawford to a minor league contract. |
| Friday, March 2nd , 1888 |
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| Signed Scouting Director Howard Bloomer to a 3-year, $151 per year contract. |
