# Relationship history for MSHA mine 0600742

Current hierarchy: **Charles J  Wojtkun → Oakwood Farm → Oakwood Farm**

- 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

- **operator_operates_mine:** Oakwood Farm → Oakwood Farm; 2007-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles J  Wojtkun et al → Oakwood Farm; 2007-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles J  Wojtkun et al → Oakwood Farm; 2007-06-06 to current/open; source msha-controller-operator-history