# Relationship history for MSHA mine 3800020

Current hierarchy: **Donald  Conte → Georgia Stone Management LLC → KERSHAW PINK**

- 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

- **operator_operates_mine:** Matthews International Corp → KERSHAW PINK; 1950-01-01 to 1992-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Thomas F  Purner → KERSHAW PINK; 1950-01-01 to 1992-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Thomas F  Purner → Matthews International Corp; 1950-01-01 to 1992-05-31; source msha-controller-operator-history
- **controller_controls_mine:** George T  Oglesby → KERSHAW PINK; 1992-05-22 to 1997-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Carolina Quarries Inc → KERSHAW PINK; 1992-06-01 to 1997-10-31; source msha-controller-operator-history
- **controller_controls_operator:** George T  Oglesby → Carolina Quarries Inc; 1992-06-01 to 1997-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Antonio C  Ramos → KERSHAW PINK; 1997-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carolina Quarries Inc → KERSHAW PINK; 1997-11-01 to 2007-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Kurt M  Swenson → KERSHAW PINK; 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 2007-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Stone Industries, Inc. → KERSHAW PINK; 2007-06-01 to 2024-09-09; source msha-controller-operator-history
- **controller_controls_operator:** Antonio C  Ramos → Georgia Stone Industries, Inc.; 2007-06-01 to 2024-09-09; source msha-controller-operator-history
- **controller_controls_mine:** Polycor Inc → KERSHAW PINK; 2016-09-21 to 2023-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Polycor Inc → Carolina Quarries Inc; 2016-09-21 to 2007-05-31; source msha-controller-operator-history
- **controller_controls_mine:** TorQuest Partners Inc → KERSHAW PINK; 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 2007-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Polycor Inc → KERSHAW PINK; 2023-09-01 to 2026-01-27; source msha-controller-operator-history
- **controller_controls_operator:** Polycor Inc → Carolina Quarries Inc; 2023-09-01 to 2007-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Stone Management LLC → KERSHAW PINK; 2024-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Conte → KERSHAW PINK; 2024-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Conte → Georgia Stone Management LLC; 2024-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → KERSHAW PINK; 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 2007-05-31; source msha-controller-operator-history