# Relationship history for MSHA mine 4604937

Current hierarchy: **Smith E P Tatum → Eastern Sewell Coal Company Inc → Sewell Tipple No 2**

- 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:** Turner J Preston → Sewell Tipple No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Turner Coal Company → Sewell Tipple No 2; 1975-11-12 to 1979-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Turner J Preston → Turner Coal Company; 1975-11-12 to 1979-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Coventry Energy Corp → Sewell Tipple No 2; 1978-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ellison Coal Company Inc → Sewell Tipple No 2; 1979-05-01 to 1980-02-18; source msha-controller-operator-history
- **controller_controls_operator:** Coventry Energy Corp → Ellison Coal Company Inc; 1979-05-01 to 1980-02-18; source msha-controller-operator-history
- **operator_operates_mine:** Turner Coal Company → Sewell Tipple No 2; 1980-02-19 to 1981-11-24; source msha-controller-operator-history
- **controller_controls_operator:** Turner J Preston → Turner Coal Company; 1980-02-19 to 1981-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Smith E P Tatum → Sewell Tipple No 2; 1981-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Sewell Coal Company Inc → Sewell Tipple No 2; 1981-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith E P Tatum → Eastern Sewell Coal Company Inc; 1981-11-25 to current/open; source msha-controller-operator-history