# Relationship history for MSHA mine 2301872

Current hierarchy: **O'Brien Industrial Holdings LLC → Missouri Minerals Processing Inc → Mathews Pit**

- 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:** O'Brien Industrial Holdings LLC → Mathews Pit; 1979-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Missouri Minerals Processing Inc → Mathews Pit; 1982-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** O'Brien Industrial Holdings LLC → Missouri Minerals Processing Inc; 1982-09-01 to current/open; source msha-controller-operator-history