# Relationship history for MSHA mine 3200709

Current hierarchy: **Jon Clifford  Lindberg → Lindberg Brothers Inc → BROBST PIT**

- 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

- **operator_operates_mine:** B & M Repair → BROBST PIT; 1987-08-01 to 1991-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Brobst → BROBST PIT; 1987-08-01 to 1991-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Brobst → B & M Repair; 1987-08-01 to 1991-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Jon Clifford  Lindberg → BROBST PIT; 1989-06-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lindberg Brothers Inc → BROBST PIT; 1991-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jon Clifford  Lindberg → Lindberg Brothers Inc; 1991-07-17 to current/open; source msha-controller-operator-history