# Relationship history for MSHA mine 0404807

Current hierarchy: **James  Richert → Coronet Concrete Products → Thousand Palms Pit**

- 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:** A-1 Aggregates Inc → Thousand Palms Pit; 1986-05-01 to 2008-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Terri  Stelter  et al → Thousand Palms Pit; 1986-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terri  Stelter  et al → A-1 Aggregates Inc; 1986-05-01 to 2008-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Taiheiyo Cement Corp → Thousand Palms Pit; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James  Richert → Thousand Palms Pit; 2006-07-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CalPortland → Thousand Palms Pit; 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 → Thousand Palms Pit; 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