# Relationship history for MSHA mine 3102017

Current hierarchy: **Vickers C L → C L Vickers Transfer Inc → Richmond County Mine**

- 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:** Vickers C L → Richmond County Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C L Vickers Transfer Inc → Richmond County Mine; 1987-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vickers C L → C L Vickers Transfer Inc; 1987-10-01 to current/open; source msha-controller-operator-history