# Relationship history for MSHA mine 2400489

Current hierarchy: **CRH PLC → Montana Mtls & Cons → Mill Creek**

- 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:** S & N Concrete → Mill Creek; 1950-01-01 to 1986-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Don  Stanisich et al → Mill Creek; 1950-01-01 to 1986-06-09; source msha-controller-operator-history
- **controller_controls_operator:** Don  Stanisich et al → S & N Concrete; 1950-01-01 to 1986-06-09; source msha-controller-operator-history
- **operator_operates_mine:** S & N Concrete Inc → Mill Creek; 1986-06-10 to 2009-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Martha J  Sestrich → Mill Creek; 1986-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martha J  Sestrich → S & N Concrete Inc; 1986-06-10 to 2009-08-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Mill Creek; 2002-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S & N Concrete and Materials, Inc. → Mill Creek; 2009-09-01 to 2024-02-18; source msha-controller-operator-history
- **controller_controls_mine:** Chris  Hanson et al → Mill Creek; 2009-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Hanson et al → S & N Concrete and Materials, Inc.; 2009-09-01 to 2024-02-18; source msha-controller-operator-history
- **operator_operates_mine:** Montana Mtls & Cons → Mill Creek; 2024-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Montana Mtls & Cons; 2024-02-19 to current/open; source msha-controller-operator-history