# Relationship history for MSHA mine 0301331

Current hierarchy: **Brickey William C → Cavanal Mining Corp → Poteau No 1 Surface**

- 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:** Cavanal Mining Corp → Poteau No 1 Surface; 1977-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brickey William C → Poteau No 1 Surface; 1977-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brickey William C → Cavanal Mining Corp; 1977-01-01 to current/open; source msha-controller-operator-history