# Relationship history for MSHA mine 0900029

Current hierarchy: **Polycor Inc → Georgia Stone Quarries Inc. → Tate 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:** Georgia Marble Company → Tate Quarry; 1950-01-01 to 1989-05-30; source msha-controller-operator-history
- **controller_controls_mine:** Jim Walter Corp → Tate Quarry; 1950-01-01 to 1989-05-30; source msha-controller-operator-history
- **controller_controls_operator:** Jim Walter Corp → Georgia Marble Company; 1950-01-01 to 1989-05-30; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Marble Company → Tate Quarry; 1989-05-31 to 2003-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → Tate Quarry; 1989-05-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Georgia Marble Company; 1989-05-31 to 2003-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Stone Quarries Inc. → Tate Quarry; 2003-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Polycor Inc → Tate Quarry; 2003-08-05 to 2023-08-09; source msha-controller-operator-history
- **controller_controls_operator:** Polycor Inc → Georgia Stone Quarries Inc.; 2003-08-05 to 2023-08-09; source msha-controller-operator-history
- **controller_controls_mine:** TorQuest Partners Inc → Tate Quarry; 2023-08-10 to 2023-08-31; source msha-controller-operator-history
- **controller_controls_operator:** TorQuest Partners Inc → Georgia Stone Quarries Inc.; 2023-08-10 to 2023-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Polycor Inc → Tate Quarry; 2023-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Polycor Inc → Georgia Stone Quarries Inc.; 2023-09-01 to current/open; source msha-controller-operator-history