# Relationship history for MSHA mine 2900078

Current hierarchy: **George F  Cudahy → American Eagle Brick Company → EAGLE MINE**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** El Paso Brick Company → EAGLE MINE; 1950-01-01 to 1990-10-18; source msha-controller-operator-history
- **controller_controls_mine:** Ronald  Calhoun  et al → EAGLE MINE; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Calhoun  et al → El Paso Brick Company; 1950-01-01 to 1990-10-18; source msha-controller-operator-history
- **operator_operates_mine:** American Eagle Brick Company → EAGLE MINE; 1990-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George F  Cudahy → EAGLE MINE; 1990-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George F  Cudahy → American Eagle Brick Company; 1990-10-19 to current/open; source msha-controller-operator-history