# Relationship history for MSHA mine 1508619

Current hierarchy: **Wilson Henry → Wilson Coal Company → No 1 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Wilson Coal Company → No 1 Mine; 1975-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilson Henry → No 1 Mine; 1975-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilson Henry → Wilson Coal Company; 1975-08-01 to current/open; source msha-controller-operator-history