# Relationship history for MSHA mine 1500094

Current hierarchy: **CRH PLC → Hinkle Contracting Company LLC → Somerset Stone Company**

- 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

- **controller_controls_mine:** Summit Materials LLC → Somerset Stone Company; 1950-01-01 to 2022-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Somerset Stone Company Inc → Somerset Stone Company; 1950-01-01 to 1984-11-29; source msha-controller-operator-history
- **controller_controls_mine:** R W  Eller → Somerset Stone Company; 1950-01-01 to 1984-11-29; source msha-controller-operator-history
- **controller_controls_operator:** R W  Eller → Somerset Stone Company Inc; 1950-01-01 to 1984-11-29; source msha-controller-operator-history
- **operator_operates_mine:** Hinkle Contracting Company LLC → Somerset Stone Company; 1984-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Hinkle Contracting Company LLC; 1984-11-30 to 2022-05-13; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Somerset Stone Company; 2022-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hinkle Contracting Company LLC; 2022-05-14 to current/open; source msha-controller-operator-history