# Relationship history for MSHA mine 4605830

Current hierarchy: **Jack  Easter → Landmark Corp → Lower Hewitt**

- 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:** American Electric Power Company Inc → Lower Hewitt; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern Appalachian Coal Company → Lower Hewitt; 1978-07-01 to 1988-09-25; source msha-controller-operator-history
- **controller_controls_operator:** American Electric Power Company Inc → Southern Appalachian Coal Company; 1978-07-01 to 1988-09-25; source msha-controller-operator-history
- **operator_operates_mine:** Landmark Corp → Lower Hewitt; 1988-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jack  Easter → Lower Hewitt; 1988-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Easter → Landmark Corp; 1988-09-26 to current/open; source msha-controller-operator-history