# Relationship history for MSHA mine 4100066

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Southwest LLC → Burnet 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Lone Star Industries Inc → Burnet Plant; 1950-01-01 to 1985-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Lone Star Industries Inc → Burnet Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → Lone Star Industries Inc; 1950-01-01 to 1985-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer International Ltd → Burnet Plant; 1984-08-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer South Central Inc → Burnet Plant; 1985-07-31 to 2000-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd → Pioneer South Central Inc; 1985-07-31 to 2000-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Burnet Plant; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Central Inc → Burnet Plant; 2000-08-04 to 2004-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Burnet Plant; 2000-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Central Inc; 2000-08-04 to 2004-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates, LLC → Burnet Plant; 2004-05-10 to 2021-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates, LLC; 2004-05-10 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Burnet Plant; 2007-08-23 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates, LLC; 2007-08-23 to 2021-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Burnet Plant; 2021-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Southwest LLC → Burnet Plant; 2021-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Southwest LLC; 2021-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Burnet Plant; 2021-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Hanson Aggregates, LLC; 2021-10-01 to 2021-01-05; source msha-controller-operator-history