# Relationship history for MSHA mine 1505277

Current hierarchy: **United  Company → Wellmore Coal Corp → Wellmore Plant No 16**

- 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 → Wellmore Plant No 16; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clintwood Coal Company → Wellmore Plant No 16; 1950-01-01 to 1977-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Chaney Cecil → Wellmore Plant No 16; 1950-01-01 to 1977-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Chaney Cecil → Clintwood Coal Company; 1950-01-01 to 1977-08-01; source msha-controller-operator-history
- **operator_operates_mine:** Clintwood Coal Company → Wellmore Plant No 16; 1977-08-02 to 1981-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Murray G Dale & Jan Gorgen → Wellmore Plant No 16; 1977-08-02 to 1981-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Murray G Dale & Jan Gorgen → Clintwood Coal Company; 1977-08-02 to 1981-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → Wellmore Plant No 16; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1981-10-01 to current/open; source msha-controller-operator-history