# Relationship history for MSHA mine 0900050

Current hierarchy: **Quikrete Construction Materials, LLC → Georgia Stone Products, LLC → Mc Lanahan Crushed Stone**

- 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:** Mc Lanahan Crushed Stone Inc → Mc Lanahan Crushed Stone; 1950-01-01 to 2017-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Neal T  McLanahan → Mc Lanahan Crushed Stone; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Neal T  McLanahan → Mc Lanahan Crushed Stone Inc; 1950-01-01 to 2017-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Mc Lanahan Crushed Stone; 2017-08-04 to 2025-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Georgia Stone Products, LLC → Mc Lanahan Crushed Stone; 2017-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Georgia Stone Products, LLC; 2017-10-22 to 2025-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Quikrete Construction Materials, LLC → Mc Lanahan Crushed Stone; 2025-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quikrete Construction Materials, LLC → Georgia Stone Products, LLC; 2025-02-10 to current/open; source msha-controller-operator-history