# Relationship history for MSHA mine 4000067

Current hierarchy: **Rogers Group Inc → Rogers Group, Inc. → Roane County 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 → Roane County Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rogers Group Inc → Roane County Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A B Long Quarries Inc → Roane County Quarry; 1950-01-01 to 2000-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Arthur B  Long Jr → Roane County Quarry; 1950-01-01 to 2000-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Arthur B  Long Jr → A B Long Quarries Inc; 1950-01-01 to 2000-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → Roane County Quarry; 2000-06-29 to 2003-03-27; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 2000-06-29 to 2003-03-27; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials → Roane County Quarry; 2003-03-28 to 2004-05-02; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials; 2003-03-28 to 2004-05-02; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Group, Inc. → Roane County Quarry; 2004-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group, Inc.; 2004-05-03 to current/open; source msha-controller-operator-history