# Relationship history for MSHA mine 0301199

Current hierarchy: **Robby R  Robinson → Robinson Inc → Dardanelle 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:** Warren Brothers Construction Company → Dardanelle Pit; 1950-01-01 to 1979-12-05; source msha-controller-operator-history
- **controller_controls_mine:** Warren Carl → Dardanelle Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Warren Carl → Warren Brothers Construction Company; 1950-01-01 to 1979-12-05; source msha-controller-operator-history
- **controller_controls_mine:** Robby R  Robinson → Dardanelle Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Russellville Concrete Company → Dardanelle Pit; 1979-12-06 to 1982-11-04; source msha-controller-operator-history
- **controller_controls_mine:** Muskogee Ready-Mix → Dardanelle Pit; 1979-12-06 to 1982-11-04; source msha-controller-operator-history
- **controller_controls_operator:** Muskogee Ready-Mix → Russellville Concrete Company; 1979-12-06 to 1982-11-04; source msha-controller-operator-history
- **operator_operates_mine:** Robinson Inc → Dardanelle Pit; 1982-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robby R  Robinson → Robinson Inc; 1982-11-05 to current/open; source msha-controller-operator-history