# Relationship history for MSHA mine 4604250

Current hierarchy: **Voest-Alpine International Corp → Virginia Crews Coal Company → No 15**

- 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:** Massey Energy Company → No 15; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & C Coal Company → No 15; 1974-01-01 to 1974-08-05; source msha-controller-operator-history
- **controller_controls_mine:** J & C Coal Company → No 15; 1974-01-01 to 1974-08-05; source msha-controller-operator-history
- **controller_controls_operator:** J & C Coal Company → J & C Coal Company; 1974-01-01 to 1974-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Virginia Crews Coal Company → No 15; 1974-08-06 to 1983-03-07; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Virginia Crews Coal Company; 1974-08-06 to 1983-03-07; source msha-controller-operator-history
- **controller_controls_mine:** Voest-Alpine International Corp → No 15; 1978-03-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Virginia Crews Coal Company → No 15; 1983-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Voest-Alpine International Corp → Virginia Crews Coal Company; 1983-03-08 to current/open; source msha-controller-operator-history