# Relationship history for MSHA mine 4607427

Current hierarchy: **Verno John R → V M S Ltd → Trickett 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

- **operator_operates_mine:** V M S Ltd → Trickett Strip; 1987-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Verno John R → Trickett Strip; 1987-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Verno John R → V M S Ltd; 1987-12-01 to current/open; source msha-controller-operator-history