# Relationship history for MSHA mine 0404861

Current hierarchy: **La Riviere Tom & Alvin Brown → Ranch Materials → Ranch Materials**

- 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:** Tri-City Materials → Ranch Materials; 1987-01-01 to 1987-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Wise Don & Larry Goddard → Ranch Materials; 1987-01-01 to 1987-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Wise Don & Larry Goddard → Tri-City Materials; 1987-01-01 to 1987-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Ranch Materials → Ranch Materials; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** La Riviere Tom & Alvin Brown → Ranch Materials; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** La Riviere Tom & Alvin Brown → Ranch Materials; 1987-10-01 to current/open; source msha-controller-operator-history