# Relationship history for MSHA mine 4002307

Current hierarchy: **Bowlin W H → W H Bowlin Coal Company → No 1 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:** Bowlin W H → No 1 Surface; 1976-06-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W H Bowlin Coal Company → No 1 Surface; 1977-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bowlin W H → W H Bowlin Coal Company; 1977-08-01 to current/open; source msha-controller-operator-history