# Relationship history for MSHA mine 3402045

Current hierarchy: **Boral Limited → BCM Oklahoma LLC → Post Road Operation**

- 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:** BCM Oklahoma LLC → Post Road Operation; 2007-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Boral Limited → Post Road Operation; 2007-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boral Limited → BCM Oklahoma LLC; 2007-08-21 to current/open; source msha-controller-operator-history