# Relationship history for MSHA mine 4103066

Current hierarchy: **Nelson Joe → Wes Tex Sand & Gravel → River 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Billy Averett Inc → River Plant; 1981-04-01 to 1984-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Averett Billy → River Plant; 1981-04-01 to 1984-06-13; source msha-controller-operator-history
- **controller_controls_operator:** Averett Billy → Billy Averett Inc; 1981-04-01 to 1984-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Wes Tex Sand & Gravel → River Plant; 1984-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nelson Joe → River Plant; 1984-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nelson Joe → Wes Tex Sand & Gravel; 1984-06-14 to current/open; source msha-controller-operator-history