# Relationship history for MSHA mine 0404891

Current hierarchy: **Ghilotti Mario → Ghilotti Brothers Construction → Russian River Portable**

- 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

- **controller_controls_mine:** Handley Margie → Russian River Portable; 1984-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hot Rocks Inc → Russian River Portable; 1987-07-01 to 1990-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Handley Margie → Hot Rocks Inc; 1987-07-01 to 1990-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Ghilotti Mario → Russian River Portable; 1989-08-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ghilotti Brothers Construction → Russian River Portable; 1990-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ghilotti Mario → Ghilotti Brothers Construction; 1990-01-02 to current/open; source msha-controller-operator-history