# Relationship history for MSHA mine 3303686

Current hierarchy: **Smith Daniel F → White Rock Coal Company → Mine No 1**

- 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 Rock Coal Company → Mine No 1; 1978-05-01 to 1982-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Mitchell Claire E-Thomas A Crisp & James H Large → Mine No 1; 1978-05-01 to 1982-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Mitchell Claire E-Thomas A Crisp & James H Large → White Rock Coal Company; 1978-05-01 to 1982-06-23; source msha-controller-operator-history
- **operator_operates_mine:** White Rock Coal Company → Mine No 1; 1982-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Daniel F → Mine No 1; 1982-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Daniel F → White Rock Coal Company; 1982-06-24 to current/open; source msha-controller-operator-history