# Relationship history for MSHA mine 4502470

Current hierarchy: **R W M Corp → R W M Corp → Ault Field Pit And 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** R W M Corp → Ault Field Pit And Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** R W M Corp → Ault Field Pit And Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R W M Corp → R W M Corp; 1950-01-01 to current/open; source msha-controller-operator-history