# Relationship history for MSHA mine 0400118

Current hierarchy: **Morteza  Montazeri → Best Rock Products Corp → Best Rock Products Corp**

- 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

- **operator_operates_mine:** Grimes Canyon Decorative Rock → Best Rock Products Corp; 1950-01-01 to 1985-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Harold  Gould → Best Rock Products Corp; 1950-01-01 to 1985-02-12; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Gould → Grimes Canyon Decorative Rock; 1950-01-01 to 1985-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Best Rock Products Corp → Best Rock Products Corp; 1985-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Morteza  Montazeri → Best Rock Products Corp; 1985-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Morteza  Montazeri → Best Rock Products Corp; 1985-02-13 to current/open; source msha-controller-operator-history