# Relationship history for MSHA mine 4000022

Current hierarchy: **Lhoist Group → Martin Marietta Materials, Inc → Anderson Mine and Mill**

- 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

- **operator_operates_mine:** Cowan Stone Company → Anderson Mine and Mill; 1950-01-01 to 1988-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Cowan Stone Company → Anderson Mine and Mill; 1950-01-01 to 1989-09-15; source msha-controller-operator-history
- **controller_controls_operator:** Cowan Stone Company → Cowan Stone Company; 1950-01-01 to 1988-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Franklin Industries Inc → Anderson Mine and Mill; 1950-01-01 to 2006-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Lhoist North America Of Tennessee, LLC → Anderson Mine and Mill; 1988-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Franklin Industries Inc → Lhoist North America Of Tennessee, LLC; 1988-11-01 to 2006-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Lhoist Group → Anderson Mine and Mill; 2006-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lhoist Group → Lhoist North America Of Tennessee, LLC; 2006-12-01 to current/open; source msha-controller-operator-history