# Relationship history for MSHA mine 4401498

Current hierarchy: **Pittston Company → Jewell Ridge Coal Corp → No 7**

- 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

- **controller_controls_mine:** Pittston Company → No 7; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R & W Coal Company → No 7; 1950-01-01 to 1971-05-21; source msha-controller-operator-history
- **controller_controls_mine:** Tester Rufus → No 7; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tester Rufus → R & W Coal Company; 1950-01-01 to 1971-05-21; source msha-controller-operator-history
- **operator_operates_mine:** Jewell Ridge Coal Corp → No 7; 1971-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Jewell Ridge Coal Corp; 1971-05-22 to current/open; source msha-controller-operator-history