# Relationship history for MSHA mine 0103068

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials Inc → Alabaster Quarry**

- 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

- **controller_controls_mine:** Martin Marietta Materials Inc → Alabaster Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** U S Aggregate Inc → Alabaster Quarry; 1994-07-13 to 2002-05-28; source msha-controller-operator-history
- **operator_operates_mine:** SRM Aggregates,  Inc. → Alabaster Quarry; 1996-01-01 to 2002-05-28; source msha-controller-operator-history
- **controller_controls_operator:** U S Aggregate Inc → SRM Aggregates,  Inc.; 1996-01-01 to 2002-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Inc → Alabaster Quarry; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials Inc; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Alabaster Quarry; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → SRM Aggregates,  Inc.; 2002-05-29 to 2002-05-28; source msha-controller-operator-history