# Relationship history for MSHA mine 1201966

Current hierarchy: **Heidelberg Materials AG → Hanson Aggregates Midwest, LLC → Harding Street Quarry-Underground**

- 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:** American Aggregates Corp → Harding Street Quarry-Underground; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Harding Street Quarry-Underground; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Aggregates Corp → Harding Street Quarry-Underground; 1984-12-01 to 1987-02-03; source msha-controller-operator-history
- **controller_controls_operator:** American Aggregates Corp → American Aggregates Corp; 1984-12-01 to 1987-02-03; source msha-controller-operator-history
- **operator_operates_mine:** American Aggregates Corp → Harding Street Quarry-Underground; 1987-02-04 to 1989-08-09; source msha-controller-operator-history
- **controller_controls_mine:** Consolidated Gold Fields Limited → Harding Street Quarry-Underground; 1987-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Consolidated Gold Fields Limited → American Aggregates Corp; 1987-02-04 to 1989-08-09; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Harding Street Quarry-Underground; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Harding Street Quarry-Underground; 1989-03-10 to 1990-02-01; source msha-controller-operator-history
- **operator_operates_mine:** American Aggregates Corp → Harding Street Quarry-Underground; 1989-08-10 to 1990-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → American Aggregates Corp; 1989-08-10 to 1990-02-01; source msha-controller-operator-history
- **operator_operates_mine:** American Aggregates Corp → Harding Street Quarry-Underground; 1990-02-02 to 1997-05-27; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → Harding Street Quarry-Underground; 1990-02-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → American Aggregates Corp; 1990-02-02 to 1997-05-27; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → Harding Street Quarry-Underground; 1997-05-28 to 1998-01-18; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1997-05-28 to 1998-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Midwest, LLC → Harding Street Quarry-Underground; 1998-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Midwest, LLC; 1998-01-19 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Harding Street Quarry-Underground; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Midwest, LLC; 2007-08-23 to current/open; source msha-controller-operator-history