# Relationship history for MSHA mine 3003755

Current hierarchy: **Bradley A  Henry → The Blue Rock Co. Inc. → Athens Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** The Blue Rock Co. Inc. → Athens Quarry; 2010-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bradley A  Henry → Athens Quarry; 2010-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bradley A  Henry → The Blue Rock Co. Inc.; 2010-05-10 to current/open; source msha-controller-operator-history