# Relationship history for MSHA mine 3606873

Current hierarchy: **Golden Junior → Target Industries Inc → Target No 1 Mine**

- 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:** Target Industries Inc → Target No 1 Mine; 1979-09-01 to 1983-12-21; source msha-controller-operator-history
- **controller_controls_mine:** Campbell David O → Target No 1 Mine; 1979-09-01 to 1983-12-21; source msha-controller-operator-history
- **controller_controls_operator:** Campbell David O → Target Industries Inc; 1979-09-01 to 1983-12-21; source msha-controller-operator-history
- **operator_operates_mine:** Target Industries Inc → Target No 1 Mine; 1983-12-22 to 1995-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Ferens Joseph E → Target No 1 Mine; 1983-12-22 to 1995-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Ferens Joseph E → Target Industries Inc; 1983-12-22 to 1995-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Target Industries Inc → Target No 1 Mine; 1995-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Golden Junior → Target No 1 Mine; 1995-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Golden Junior → Target Industries Inc; 1995-07-01 to current/open; source msha-controller-operator-history