# Relationship history for MSHA mine 1601364

Current hierarchy: **Holcim Ltd → Lafarge West, Inc. → Isabel Operations**

- 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:** Texas Industries Inc → Isabel Operations; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** TXI → Isabel Operations; 2000-06-01 to 2005-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → TXI; 2000-06-01 to 2005-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Isabel Operations; 2001-07-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Isabel Operations; 2002-01-31 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Texas Industries Inc → Isabel Operations; 2004-12-01 to 2014-07-01; source msha-controller-operator-history
- **operator_operates_mine:** TXI Operations LP → Isabel Operations; 2005-03-15 to 2008-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → TXI Operations LP; 2005-03-15 to 2008-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Aggregates Southeast Inc → Isabel Operations; 2008-06-01 to 2013-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Aggregates Southeast Inc; 2008-06-01 to 2013-03-20; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge West, Inc. → Isabel Operations; 2013-03-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge West, Inc.; 2013-03-21 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Isabel Operations; 2014-07-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → TXI Operations LP; 2014-07-02 to 2008-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Isabel Operations; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge West, Inc.; 2015-07-10 to current/open; source msha-controller-operator-history