# Relationship history for MSHA mine 0405447

Current hierarchy: **James  Richert → Coronet Concrete Products → DILLON PLANT**

- 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:** Terri  Stelter  et al → DILLON PLANT; 1986-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Taiheiyo Cement Corp → DILLON PLANT; 1990-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A-1 Aggregates Inc → DILLON PLANT; 2000-06-01 to 2008-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Terri  Stelter  et al → A-1 Aggregates Inc; 2000-06-01 to 2008-06-02; source msha-controller-operator-history
- **controller_controls_mine:** James  Richert → DILLON PLANT; 2006-07-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CalPortland → DILLON PLANT; 2008-06-03 to 2019-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Taiheiyo Cement Corp → CalPortland; 2008-06-03 to 2019-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Coronet Concrete Products → DILLON PLANT; 2019-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Richert → Coronet Concrete Products; 2019-07-01 to current/open; source msha-controller-operator-history