# Relationship history for MSHA mine 4003289

Current hierarchy: **Ford F  Graham; Kevin C  Davis → Vulcan Blue Gem Coal, LLC → VBGArea3**

- 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:** Vulcan Blue Gem Coal, LLC → VBGArea3; 2006-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ford F  Graham et al → VBGArea3; 2006-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ford F  Graham et al → Vulcan Blue Gem Coal, LLC; 2006-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin C  Davis et al → Vulcan Blue Gem Coal, LLC; 2006-12-01 to current/open; source msha-controller-operator-history