# Relationship history for MSHA mine 0301614

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → HATTON 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Martin Marietta Materials Inc → HATTON QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Herzog Stone Products Inc → HATTON QUARRY; 1986-09-01 to 1994-12-16; source msha-controller-operator-history
- **controller_controls_mine:** Herzog Contracting Corp → HATTON QUARRY; 1986-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Herzog Contracting Corp → Herzog Stone Products Inc; 1986-09-01 to 1994-12-16; source msha-controller-operator-history
- **operator_operates_mine:** Meridian → HATTON QUARRY; 1994-12-17 to 2001-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Meridian Aggregates Company LP → HATTON QUARRY; 1994-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Meridian Aggregates Company LP → Meridian; 1994-12-17 to 2001-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company LP → HATTON QUARRY; 2001-04-03 to 2005-06-29; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → HATTON QUARRY; 2001-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Meridian Aggregates Company LP; 2001-04-03 to 2005-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → HATTON QUARRY; 2005-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2005-06-30 to current/open; source msha-controller-operator-history