# Relationship history for MSHA mine 4700144

Current hierarchy: **Paul W/and Diana Gerke Family Trust; Chad  Gerke; Jay  Gerke → Gerke Excavating Inc → Gerke Plant #3**

- 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:** Erickson Quarries Inc → Gerke Plant #3; 1950-01-01 to 2003-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Erickson → Gerke Plant #3; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Erickson → Erickson Quarries Inc; 1950-01-01 to 2003-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Gerke Excavating Inc → Gerke Plant #3; 2003-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard A  Gerke  et al → Gerke Plant #3; 2003-05-12 to 2026-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Richard A  Gerke  et al → Gerke Excavating Inc; 2003-05-12 to 2026-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Paul W/and Diana Gerke Family Trust et al → Gerke Plant #3; 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