# Relationship history for MSHA mine 4800082

Current hierarchy: **Lipscomb James W → Cougar Coal Company → Swanson 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:** Western Wyoming Fuel Company → Swanson Mine; 1950-01-01 to 1987-12-13; source msha-controller-operator-history
- **controller_controls_mine:** Herne George → Swanson Mine; 1950-01-01 to 1987-12-13; source msha-controller-operator-history
- **controller_controls_operator:** Herne George → Western Wyoming Fuel Company; 1950-01-01 to 1987-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Lion Coal Company → Swanson Mine; 1987-12-14 to 1994-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Anselmi John → Swanson Mine; 1987-12-14 to 1994-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Anselmi John → Lion Coal Company; 1987-12-14 to 1994-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Cougar Coal Company → Swanson Mine; 1994-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lipscomb James W → Swanson Mine; 1994-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lipscomb James W → Cougar Coal Company; 1994-08-23 to current/open; source msha-controller-operator-history