# Relationship history for MSHA mine 1510057

Current hierarchy: **Paul D  Corbin; Mike M  Corbin → Corbin Coal Company Inc → No 2 Surface**

- 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:** Paul D  Corbin  et al → No 2 Surface; 1975-02-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Corbin Coal Company Inc → No 2 Surface; 1976-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul D  Corbin  et al → Corbin Coal Company Inc; 1976-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike M  Corbin  et al → Corbin Coal Company Inc; 1976-10-22 to current/open; source msha-controller-operator-history