# Relationship history for MSHA mine 4403695

Current hierarchy: **United  Company → Wellmore Coal Corp No 6 → No 30 Mine**

- 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:** T & H Coal Company Inc → No 30 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → No 30 Mine; 1973-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T & H Coal Company Inc → No 30 Mine; 1974-01-01 to 1977-10-20; source msha-controller-operator-history
- **controller_controls_operator:** T & H Coal Company Inc → T & H Coal Company Inc; 1974-01-01 to 1977-10-20; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp No 6 → No 30 Mine; 1977-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp No 6; 1977-10-21 to current/open; source msha-controller-operator-history