# Relationship history for MSHA mine 1518068

Current hierarchy: **Rogers Group Inc → Rogers Group Inc. → Boone 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:** Rogers Group Inc → Boone Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sterling Materials → Boone Quarry; 1998-07-01 to 2025-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Boone Trust, Samuel A.B. (Alex) Boone Trustee → Boone Quarry; 1998-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boone Trust, Samuel A.B. (Alex) Boone Trustee → Sterling Materials; 1998-07-01 to 2025-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Rogers Group Inc. → Boone Quarry; 2025-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Group Inc → Rogers Group Inc.; 2025-04-03 to current/open; source msha-controller-operator-history