| item | description | category | filter | more on... |
| CTRX | C and T Refinery Incorporated | Regional/Railroads |
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| CTRX | Celtrix Pharmaceuticals, Inc. | Business/General |
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| CTRX | Center-X Coordinate | Edu./Mathematics |
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| CTRX | Centrex Technologies | Business/Firms |
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| CTRX | CoTherix, Inc. | Business/General |
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