# Relationship history for MSHA mine 0101019

Current hierarchy: **Rials William James → R G W Inc → Tuscaloosa Pit 500**

- 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:** R G W Inc → Tuscaloosa Pit 500; 1973-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rials William James → Tuscaloosa Pit 500; 1973-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rials William James → R G W Inc; 1973-01-01 to current/open; source msha-controller-operator-history