# Relationship history for MSHA mine 4404996

Current hierarchy: **E M P Corp & Southland Contractors Inc → Coal Recovery Enterprises → Toms Creek Prep Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Coal Recovery Enterprises → Toms Creek Prep Plant; 1978-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** E M P Corp & Southland Contractors Inc → Toms Creek Prep Plant; 1978-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** E M P Corp & Southland Contractors Inc → Coal Recovery Enterprises; 1978-03-01 to current/open; source msha-controller-operator-history