# Relationship history for MSHA mine 2102931

Current hierarchy: **Oseby F Butch-Don Jerke → Jerke Oseby Phillips Partners → Lyon-Lincoln Rock & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** J J Dirt & Gravel Hauling Inc → Lyon-Lincoln Rock & Gravel; 1984-08-01 to 1992-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Jorgensen Harold → Lyon-Lincoln Rock & Gravel; 1984-08-01 to 1992-04-12; source msha-controller-operator-history
- **controller_controls_operator:** Jorgensen Harold → J J Dirt & Gravel Hauling Inc; 1984-08-01 to 1992-04-12; source msha-controller-operator-history
- **operator_operates_mine:** Jerke Oseby Phillips Partners → Lyon-Lincoln Rock & Gravel; 1992-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oseby F Butch-Don Jerke Et Al → Lyon-Lincoln Rock & Gravel; 1992-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oseby F Butch-Don Jerke Et Al → Jerke Oseby Phillips Partners; 1992-04-13 to current/open; source msha-controller-operator-history