# Relationship history for MSHA mine 1509678

Current hierarchy: **Wilson Junior-J R Brock & Donny Ray → White Oak 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** White Oak Coal Company → No 1 Mine; 1976-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilson Junior-J R Brock & Donny Ray → No 1 Mine; 1976-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilson Junior-J R Brock & Donny Ray → White Oak Coal Company; 1976-05-01 to current/open; source msha-controller-operator-history