# Relationship history for MSHA mine 2100033

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials Inc. → Yellow Medicine 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 → Yellow Medicine Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Duininck Companies → Yellow Medicine Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Green Company Inc → Yellow Medicine Quarry; 1950-01-01 to 1979-09-04; source msha-controller-operator-history
- **controller_controls_mine:** George  Seebeck → Yellow Medicine Quarry; 1950-01-01 to 1987-12-16; source msha-controller-operator-history
- **controller_controls_operator:** George  Seebeck → Green Company Inc; 1950-01-01 to 1979-09-04; source msha-controller-operator-history
- **operator_operates_mine:** Duininck Brothers & Gilchrist → Yellow Medicine Quarry; 1979-09-05 to 1980-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Duininck Companies → Duininck Brothers & Gilchrist; 1979-09-05 to 1980-10-08; source msha-controller-operator-history
- **operator_operates_mine:** Green Company Inc → Yellow Medicine Quarry; 1980-10-09 to 1987-12-16; source msha-controller-operator-history
- **controller_controls_operator:** George  Seebeck → Green Company Inc; 1980-10-09 to 1987-12-16; source msha-controller-operator-history
- **controller_controls_mine:** Burlington Resources Inc → Yellow Medicine Quarry; 1981-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company → Yellow Medicine Quarry; 1987-12-17 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Burlington Resources Inc → Meridian Aggregates Company; 1987-12-17 to 1991-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Meridian Aggregates Company → Yellow Medicine Quarry; 1991-03-01 to 2001-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Meridian Aggregates Company LP → Yellow Medicine 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 → Yellow Medicine Quarry; 2001-04-03 to 2002-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Yellow Medicine 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 → Yellow Medicine Quarry; 2002-07-17 to 2006-11-06; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 2002-07-17 to 2006-11-06; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Inc. → Yellow Medicine Quarry; 2006-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials Inc.; 2006-11-07 to current/open; source msha-controller-operator-history