# Relationship history for MSHA mine 4703962

Current hierarchy: **Joel Robert  Ovyn; William D  Ovyn; Darren G  Ovyn → Dennis Ovyn Trucking → Wash Plant #2**

- 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:** Dennis  Ovyn → Wash Plant #2; 1994-02-01 to 2019-12-30; source msha-controller-operator-history
- **controller_controls_mine:** Darren G  Ovyn et al → Wash Plant #2; 2019-12-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dennis Ovyn Trucking → Wash Plant #2; 2024-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darren G  Ovyn et al → Dennis Ovyn Trucking; 2024-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William D  Ovyn et al → Dennis Ovyn Trucking; 2024-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joel Robert  Ovyn et al → Dennis Ovyn Trucking; 2024-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Ovyn → Dennis Ovyn Trucking; 2024-06-19 to 2019-12-30; source msha-controller-operator-history