# Relationship history for MSHA mine 4401748

Current hierarchy: **Justus Gary → Jean Coal Corp → No 1 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Lark Coal Company → No 1 Mine; 1950-01-01 to 1973-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Ramsey W L → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ramsey W L → Lark Coal Company; 1950-01-01 to 1973-04-30; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → No 1 Mine; 1973-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp No 6 → No 1 Mine; 1973-05-01 to 1980-06-15; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp No 6; 1973-05-01 to 1980-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Jean Coal Corp → No 1 Mine; 1980-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Justus Gary → No 1 Mine; 1980-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justus Gary → Jean Coal Corp; 1980-06-16 to current/open; source msha-controller-operator-history