# Relationship history for MSHA mine 4703969

Current hierarchy: **Paul W/and Diana Gerke Family Trust; Chad  Gerke; Jay  Gerke → Gerke Excavating Inc → Plant # 21**

- 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:** Richard A  Gerke  et al → Plant # 21; 2003-05-12 to 2026-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Gerke Excavating Inc → Plant # 21; 2025-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard A  Gerke  et al → Gerke Excavating Inc; 2025-01-01 to 2026-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Paul W/and Diana Gerke Family Trust et al → Plant # 21; 2026-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul W/and Diana Gerke Family Trust et al → Gerke Excavating Inc; 2026-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jay  Gerke et al → Gerke Excavating Inc; 2026-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chad  Gerke et al → Gerke Excavating Inc; 2026-04-01 to current/open; source msha-controller-operator-history