# Relationship history for MSHA mine 4606635

Current hierarchy: **Blackburn Paul E → Mc Alpin Processing Inc → #1 Refuse Pile**

- 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

- **operator_operates_mine:** Madara Coal Company Inc → #1 Refuse Pile; 1983-03-01 to 1987-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Mathena Robert-Dan P James Et Al → #1 Refuse Pile; 1983-03-01 to 1987-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Mathena Robert-Dan P James Et Al → Madara Coal Company Inc; 1983-03-01 to 1987-08-04; source msha-controller-operator-history
- **controller_controls_mine:** M A J V & Primrose Coal Company → #1 Refuse Pile; 1986-10-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thistle Coal Company → #1 Refuse Pile; 1987-08-05 to 1988-06-08; source msha-controller-operator-history
- **controller_controls_operator:** M A J V & Primrose Coal Company → Thistle Coal Company; 1987-08-05 to 1988-06-08; source msha-controller-operator-history
- **operator_operates_mine:** Mc Alpin Processing Inc → #1 Refuse Pile; 1988-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blackburn Paul E → #1 Refuse Pile; 1988-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blackburn Paul E → Mc Alpin Processing Inc; 1988-06-09 to current/open; source msha-controller-operator-history