# Relationship history for MSHA mine 1517601

Current hierarchy: **CRH PLC → Hinkle Contracting Corporation → Tipton Ridge 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:** Summit Materials LLC → Tipton Ridge Quarry; 1950-01-01 to 2022-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Hinkle Contracting Corporation → Tipton Ridge Quarry; 1994-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Hinkle Contracting Corporation; 1994-10-01 to 2022-05-13; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Tipton Ridge Quarry; 2022-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hinkle Contracting Corporation; 2022-05-14 to current/open; source msha-controller-operator-history