# Relationship history for MSHA mine 1506457

Current hierarchy: **Bailey Vernon E → Bailey Mining Company Inc → Wheelwright 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Bailey Vernon E → Wheelwright Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bailey Mining Company Inc → Wheelwright Mine; 1973-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Vernon E → Bailey Mining Company Inc; 1973-01-01 to current/open; source msha-controller-operator-history