# Relationship history for MSHA mine 4403919

Current hierarchy: **Richardson Dowell → Tar Hill Coal Inc → Mine No 1**

- 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:** H & S Coal Company Inc → Mine No 1; 1975-05-01 to 1979-05-15; source msha-controller-operator-history
- **controller_controls_mine:** Richardson Dowell → Mine No 1; 1975-05-01 to 1979-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Richardson Dowell → H & S Coal Company Inc; 1975-05-01 to 1979-05-15; source msha-controller-operator-history
- **operator_operates_mine:** Wildcat Coal Company Inc → Mine No 1; 1979-05-16 to 1980-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Richardson Edward → Mine No 1; 1979-05-16 to 1980-11-24; source msha-controller-operator-history
- **controller_controls_operator:** Richardson Edward → Wildcat Coal Company Inc; 1979-05-16 to 1980-11-24; source msha-controller-operator-history
- **operator_operates_mine:** Dowcoal Inc → Mine No 1; 1980-11-25 to 1984-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Richardson Dowell → Mine No 1; 1980-11-25 to 1984-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Richardson Dowell → Dowcoal Inc; 1980-11-25 to 1984-06-12; source msha-controller-operator-history
- **operator_operates_mine:** Tar Hill Coal Inc → Mine No 1; 1984-06-13 to 1984-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Harrison Howard Terry → Mine No 1; 1984-06-13 to 1984-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Harrison Howard Terry → Tar Hill Coal Inc; 1984-06-13 to 1984-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Tar Hill Coal Inc → Mine No 1; 1984-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richardson Dowell → Mine No 1; 1984-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richardson Dowell → Tar Hill Coal Inc; 1984-08-01 to current/open; source msha-controller-operator-history