# Relationship history for MSHA mine 2100081

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials Inc → St. Cloud 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 → St. Cloud Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J L Shiely Company → St. Cloud Quarry; 1950-01-01 to 1985-12-02; source msha-controller-operator-history
- **controller_controls_mine:** J L Shiely  Company → St. Cloud Quarry; 1950-01-01 to 1988-07-18; source msha-controller-operator-history
- **controller_controls_operator:** J L Shiely  Company → J L Shiely Company; 1950-01-01 to 1985-12-02; source msha-controller-operator-history
- **controller_controls_mine:** Burlington Resources Inc → St. Cloud Quarry; 1981-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company → St. Cloud Quarry; 1985-12-03 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Burlington Resources Inc → Meridian Aggregates Company; 1985-12-03 to 1991-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company → St. Cloud Quarry; 1991-03-01 to 2001-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Meridian Aggregates Company LP → St. Cloud Quarry; 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 → St. Cloud Quarry; 2001-04-03 to 2002-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → St. Cloud 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 2002-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → St. Cloud Quarry; 2002-07-17 to 2007-01-23; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 2002-07-17 to 2007-01-23; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Inc → St. Cloud Quarry; 2007-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials Inc; 2007-01-24 to current/open; source msha-controller-operator-history