# Relationship history for MSHA mine 3100116

Current hierarchy: **Martin Marietta Materials Inc → Carolina Quarries Inc → Crystal Pink 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:** L S Starrett Company → Crystal Pink Quarry; 1950-01-01 to 1993-11-23; source msha-controller-operator-history
- **controller_controls_mine:** Starrett D R → Crystal Pink Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Starrett D R → L S Starrett Company; 1950-01-01 to 1993-11-23; source msha-controller-operator-history
- **controller_controls_mine:** George T  Oglesby → Crystal Pink Quarry; 1992-05-22 to 1997-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Carolina Quarries Inc → Crystal Pink Quarry; 1993-11-24 to 1997-10-31; source msha-controller-operator-history
- **controller_controls_operator:** George T  Oglesby → Carolina Quarries Inc; 1993-11-24 to 1997-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Carolina Quarries Inc → Crystal Pink Quarry; 1997-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kurt M  Swenson → Crystal Pink Quarry; 1997-11-01 to 2016-09-20; source msha-controller-operator-history
- **controller_controls_operator:** Kurt M  Swenson → Carolina Quarries Inc; 1997-11-01 to 2016-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Polycor Inc → Crystal Pink Quarry; 2016-09-21 to 2023-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Polycor Inc → Carolina Quarries Inc; 2016-09-21 to 2023-02-15; source msha-controller-operator-history
- **controller_controls_mine:** TorQuest Partners Inc → Crystal Pink Quarry; 2023-02-16 to 2023-08-31; source msha-controller-operator-history
- **controller_controls_operator:** TorQuest Partners Inc → Carolina Quarries Inc; 2023-02-16 to 2023-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Polycor Inc → Crystal Pink Quarry; 2023-09-01 to 2026-01-27; source msha-controller-operator-history
- **controller_controls_operator:** Polycor Inc → Carolina Quarries Inc; 2023-09-01 to 2026-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Crystal Pink Quarry; 2026-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Carolina Quarries Inc; 2026-01-28 to current/open; source msha-controller-operator-history