# Relationship history for MSHA mine 4003224

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Southeast Agg Operations, LLC → Riverbend 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

- **operator_operates_mine:** Riverbend Construction Materials LLC → Riverbend Quarry; 2004-05-12 to 2009-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Duff  Boyd Et Al → Riverbend Quarry; 2004-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duff  Boyd Et Al → Riverbend Construction Materials LLC; 2004-05-12 to 2009-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Bart  Boyd Et Al → Riverbend Construction Materials LLC; 2004-05-12 to 2009-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Ready Mix USA Inc → Riverbend Quarry; 2008-01-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Aggregates USA LLC → Riverbend Quarry; 2009-04-29 to 2010-02-05; source msha-controller-operator-history
- **controller_controls_operator:** Ready Mix USA Inc → Aggregates USA LLC; 2009-04-29 to 2010-02-05; source msha-controller-operator-history
- **operator_operates_mine:** Aggregates USA LLC → Riverbend Quarry; 2010-02-06 to 2017-12-29; source msha-controller-operator-history
- **controller_controls_mine:** Aggregates USA Holdings LLC → Riverbend Quarry; 2010-02-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregates USA Holdings LLC → Aggregates USA LLC; 2010-02-06 to 2017-12-29; source msha-controller-operator-history
- **controller_controls_mine:** Blue Water Industries Holdings LLC → Riverbend Quarry; 2017-12-29 to 2024-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Blue Water Industries → Riverbend Quarry; 2017-12-30 to 2024-12-11; source msha-controller-operator-history
- **controller_controls_operator:** Blue Water Industries Holdings LLC → Blue Water Industries; 2017-12-30 to 2024-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Riverbend Quarry; 2024-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Blue Water Industries; 2024-04-29 to 2024-12-11; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Southeast Agg Operations, LLC → Riverbend Quarry; 2024-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Riverbend Quarry; 2024-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Southeast Agg Operations, LLC; 2024-12-12 to current/open; source msha-controller-operator-history