# Relationship history for MSHA mine 2501020

Current hierarchy: **Arnold Tom → Rush Creek Inc → Rush Creek Gravel**

- 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

- **controller_controls_mine:** Rosane Douglas & Dennis → Rush Creek Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R A & S Contracting Company → Rush Creek Gravel; 1984-06-01 to 1985-09-02; source msha-controller-operator-history
- **controller_controls_operator:** Rosane Douglas & Dennis → R A & S Contracting Company; 1984-06-01 to 1985-09-02; source msha-controller-operator-history
- **operator_operates_mine:** Rush Creek Inc → Rush Creek Gravel; 1985-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arnold Tom → Rush Creek Gravel; 1985-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arnold Tom → Rush Creek Inc; 1985-09-03 to current/open; source msha-controller-operator-history