# Relationship history for MSHA mine 1600476

Current hierarchy: **Texas Industries Inc → Louisiana Industries → Magnolia Gravel Co 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Texas Industries Inc → Magnolia Gravel Co Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Magnolia Gravel Company Inc → Magnolia Gravel Co Plant; 1950-01-01 to 1984-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Fletcher Payne → Magnolia Gravel Co Plant; 1950-01-01 to 1984-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Fletcher Payne → Magnolia Gravel Company Inc; 1950-01-01 to 1984-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Magnolia Gravel Company Inc → Magnolia Gravel Co Plant; 1984-10-01 to 1985-10-02; source msha-controller-operator-history
- **controller_controls_mine:** Herbert S  Verbois → Magnolia Gravel Co Plant; 1984-10-01 to 1985-10-02; source msha-controller-operator-history
- **controller_controls_operator:** Herbert S  Verbois → Magnolia Gravel Company Inc; 1984-10-01 to 1985-10-02; source msha-controller-operator-history
- **operator_operates_mine:** Louisiana Industries → Magnolia Gravel Co Plant; 1985-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → Louisiana Industries; 1985-10-03 to current/open; source msha-controller-operator-history