# Relationship history for MSHA mine 3605389

Current hierarchy: **Moorehead Leonard → Moorehead Coal Company → Dunlap 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Moorehead Coal Company → Dunlap Mine; 1974-12-23 to 1975-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Moorehead Leonard → Dunlap Mine; 1974-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moorehead Leonard → Moorehead Coal Company; 1974-12-23 to 1975-04-08; source msha-controller-operator-history
- **operator_operates_mine:** Joseph Shermenti → Dunlap Mine; 1975-04-09 to 1977-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Shermenti Joseph → Dunlap Mine; 1975-04-09 to 1977-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Shermenti Joseph → Joseph Shermenti; 1975-04-09 to 1977-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Moorehead Coal Company → Dunlap Mine; 1977-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Moorehead Leonard → Moorehead Coal Company; 1977-09-12 to current/open; source msha-controller-operator-history