# Relationship history for MSHA mine 4800266

Current hierarchy: **Raymond W  DeVries → Big Horn Redi-Mix Inc → FEELY PIT WASH PLANT**

- 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:** Big Horn Redi-Mix Inc → FEELY PIT WASH PLANT; 1950-01-01 to 1997-07-15; source msha-controller-operator-history
- **controller_controls_mine:** C R  Walton  et al → FEELY PIT WASH PLANT; 1950-01-01 to 1997-07-15; source msha-controller-operator-history
- **controller_controls_operator:** C R  Walton  et al → Big Horn Redi-Mix Inc; 1950-01-01 to 1997-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Monroc Inc → FEELY PIT WASH PLANT; 1994-10-01 to 1999-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Big Horn Redi-Mix Inc → FEELY PIT WASH PLANT; 1997-07-16 to 1999-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Monroc Inc → Big Horn Redi-Mix Inc; 1997-07-16 to 1999-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Big Horn Redi-Mix Inc → FEELY PIT WASH PLANT; 1999-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raymond W  DeVries → FEELY PIT WASH PLANT; 1999-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond W  DeVries → Big Horn Redi-Mix Inc; 1999-05-10 to current/open; source msha-controller-operator-history