# Relationship history for MSHA mine 4102248

Current hierarchy: **Lhoist Group → Franklin Industrial Minerals → FRANKLIN INDUSTRIAL MINERALS**

- 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

- **controller_controls_mine:** Franklin Industries Inc → FRANKLIN INDUSTRIAL MINERALS; 1950-01-01 to 2006-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Franklin Industrial Minerals → FRANKLIN INDUSTRIAL MINERALS; 1983-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Franklin Industries Inc → Franklin Industrial Minerals; 1983-03-01 to 2006-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Lhoist Group → FRANKLIN INDUSTRIAL MINERALS; 2006-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lhoist Group → Franklin Industrial Minerals; 2006-12-01 to current/open; source msha-controller-operator-history