# Relationship history for MSHA mine 2301545

Current hierarchy: **O'Brien Industrial Holdings LLC → Christy Minerals LLC → Christy Minerals 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:** Christy Minerals LLC → Christy Minerals Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** O'Brien Industrial Holdings LLC → Christy Minerals Plant; 2002-07-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** O'Brien Industrial Holdings LLC → Christy Minerals LLC; 2002-07-04 to current/open; source msha-controller-operator-history