# Relationship history for MSHA mine 0301649

Current hierarchy: **Meridian Aggregates Company LP → Meridian → NORTH 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** R M Courson Inc → NORTH PLANT; 1989-03-01 to 1996-03-03; source msha-controller-operator-history
- **controller_controls_mine:** R M Courson Inc → NORTH PLANT; 1989-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R M Courson Inc → R M Courson Inc; 1989-03-01 to 1996-03-03; source msha-controller-operator-history
- **controller_controls_mine:** Meridian Aggregates Company LP → NORTH PLANT; 1994-12-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meridian → NORTH PLANT; 1996-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Meridian Aggregates Company LP → Meridian; 1996-03-04 to current/open; source msha-controller-operator-history