# Relationship history for MSHA mine 3302995

Current hierarchy: **Phil A  Bowman → Waterloo Coal Company → Hawks 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Phil A  Bowman  et al → Hawks Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Waterloo Coal Company → Hawks Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phil A  Bowman  et al → Waterloo Coal Company; 1974-01-01 to current/open; source msha-controller-operator-history