# Relationship history for MSHA mine 1517370

Current hierarchy: **United  Company → Wellmore Coal Corp → Hc-4**

- 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:** United  Company → Hc-4; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roger  Coleman → Hc-4; 1989-05-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → Hc-4; 1993-02-01 to 1994-09-27; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1993-02-01 to 1994-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Raider Mining Inc → Hc-4; 1994-09-28 to 1995-11-28; source msha-controller-operator-history
- **controller_controls_operator:** Roger  Coleman → Raider Mining Inc; 1994-09-28 to 1995-11-28; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → Hc-4; 1995-11-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1995-11-29 to current/open; source msha-controller-operator-history