# Relationship history for MSHA mine 3401285

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Mill Creek**

- 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 → Mill Creek; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** St Louis-San Francisco Railway Company → Mill Creek; 1980-04-22 to 1981-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Clarkland Inc → Mill Creek; 1980-09-01 to 1981-10-31; source msha-controller-operator-history
- **controller_controls_operator:** St Louis-San Francisco Railway Company → Clarkland Inc; 1980-09-01 to 1981-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company → Mill Creek; 1981-11-01 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Burlington Resources Inc → Mill Creek; 1981-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burlington Resources Inc → Meridian Aggregates Company; 1981-11-01 to 1991-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company → Mill Creek; 1991-03-01 to 2001-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Meridian Aggregates Company LP → Mill Creek; 1991-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Meridian Aggregates Company LP → Meridian Aggregates Company; 1991-03-01 to 2001-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company LP → Mill Creek; 2001-04-03 to 2006-05-24; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Mill Creek; 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 2006-05-24; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Mill Creek; 2006-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2006-05-25 to current/open; source msha-controller-operator-history