# Relationship history for MSHA mine 0402251

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta San Diego Aggregates, LLC → Slaughterhouse Aggregates**

- 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:** Asphalt Inc → Slaughterhouse Aggregates; 1950-01-01 to 1998-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Ehly Ray → Slaughterhouse Aggregates; 1950-01-01 to 1998-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Ehly Ray → Asphalt Inc; 1950-01-01 to 1998-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Slaughterhouse Aggregates; 1987-05-01 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Asphalt Inc → Slaughterhouse Aggregates; 1998-12-01 to 2000-09-19; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer International Ltd → Slaughterhouse Aggregates; 1998-12-01 to 2000-09-19; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd → Asphalt Inc; 1998-12-01 to 2000-09-19; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Pacific Southwest Inc → Slaughterhouse Aggregates; 2000-09-20 to 2024-06-25; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Pacific Southwest Inc; 2000-09-20 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Slaughterhouse Aggregates; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Pacific Southwest Inc; 2007-08-23 to 2024-06-25; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Slaughterhouse Aggregates; 2021-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta San Diego Aggregates, LLC → Slaughterhouse Aggregates; 2024-06-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta San Diego Aggregates, LLC; 2024-06-26 to current/open; source msha-controller-operator-history