# Relationship history for MSHA mine 3303375

Current hierarchy: **Beckley Billie M → Becko Construction Co → Beckco No 5 Strip**

- 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:** Beckley Billie M → Beckco No 5 Strip; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Becko Construction Co → Beckco No 5 Strip; 1975-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beckley Billie M → Becko Construction Co; 1975-10-15 to current/open; source msha-controller-operator-history