# Relationship history for MSHA mine 0501851

Current hierarchy: **F George  Robinson Jr → Robinson Brick Company → Apache**

- 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:** Robinson Brick Company → Apache; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** F George  Robinson Jr → Apache; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** F George  Robinson Jr → Robinson Brick Company; 1950-01-01 to current/open; source msha-controller-operator-history