# Relationship history for MSHA mine 2102425

Current hierarchy: **John R  Carlson → Carlson Brothers Inc → Boreke 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Slama Brothers Inc → Boreke Pit; 1950-01-01 to 1980-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Slama Mark → Boreke Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Slama Mark → Slama Brothers Inc; 1950-01-01 to 1980-06-30; source msha-controller-operator-history
- **controller_controls_mine:** John R  Carlson → Boreke Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carlson Brothers Inc → Boreke Pit; 1980-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Carlson → Carlson Brothers Inc; 1980-07-01 to current/open; source msha-controller-operator-history