# Relationship history for MSHA mine 4606118

Current hierarchy: **Paul Richard D & Mike Gunnoe → Clover Leaf Coal Company Inc → #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

- **controller_controls_mine:** Calvert Retha → #1; 1977-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Calvert Development Company → #1; 1980-03-01 to 1982-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Calvert Retha → Calvert Development Company; 1980-03-01 to 1982-02-14; source msha-controller-operator-history
- **operator_operates_mine:** Clover Leaf Coal Company Inc → #1; 1982-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul Richard D & Mike Gunnoe → #1; 1982-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul Richard D & Mike Gunnoe → Clover Leaf Coal Company Inc; 1982-02-15 to current/open; source msha-controller-operator-history