# Relationship history for MSHA mine 2300116

Current hierarchy: **Joerling Jim → Joerling Bros Quarry Inc → Joerling Bros Quarry #1**

- 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:** Joerling Brothers Quarries Inc → Joerling Bros Quarry #1; 1950-01-01 to 1988-01-26; source msha-controller-operator-history
- **controller_controls_mine:** Joerling Clarence → Joerling Bros Quarry #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joerling Clarence → Joerling Brothers Quarries Inc; 1950-01-01 to 1988-01-26; source msha-controller-operator-history
- **operator_operates_mine:** Joerling Bros Quarry Inc → Joerling Bros Quarry #1; 1988-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joerling Jim → Joerling Bros Quarry #1; 1988-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joerling Jim → Joerling Bros Quarry Inc; 1988-01-27 to current/open; source msha-controller-operator-history