# Relationship history for MSHA mine 4100991

Current hierarchy: **Lhoist Group → Martin Marietta Minerals, Inc. → Crawford Mine & 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Franklin Industries Inc → Crawford Mine & Mill; 1950-01-01 to 2006-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Chemical Lime Company → Crawford Mine & Mill; 1950-01-01 to 1998-12-30; source msha-controller-operator-history
- **operator_operates_mine:** Tonk Products Inc → Crawford Mine & Mill; 1950-01-01 to 1986-02-17; source msha-controller-operator-history
- **controller_controls_mine:** J W  Broughton → Crawford Mine & Mill; 1950-01-01 to 1986-02-17; source msha-controller-operator-history
- **controller_controls_operator:** J W  Broughton → Tonk Products Inc; 1950-01-01 to 1986-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Tonk Products Inc → Crawford Mine & Mill; 1986-02-18 to 1988-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Amcar Inc → Crawford Mine & Mill; 1986-02-18 to 1988-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Amcar Inc → Tonk Products Inc; 1986-02-18 to 1988-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Franklin Industries Incorporated → Crawford Mine & Mill; 1988-01-22 to 2012-01-19; source msha-controller-operator-history
- **controller_controls_operator:** Franklin Industries Inc → Franklin Industries Incorporated; 1988-01-22 to 2006-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Lhoist Group → Crawford Mine & Mill; 1998-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lhoist Group → Crawford Mine & Mill; 2006-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lhoist Group → Franklin Industries Incorporated; 2006-12-01 to 2012-01-19; source msha-controller-operator-history
- **operator_operates_mine:** Lhoist North America of Texas, LLC → Crawford Mine & Mill; 2012-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lhoist Group → Lhoist North America of Texas, LLC; 2012-01-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chemical Lime Company → Lhoist North America of Texas, LLC; 2012-01-20 to 1998-12-30; source msha-controller-operator-history