# Relationship history for MSHA mine 4800777

Current hierarchy: **Raymond W  DeVries → Big Horn Redi-Mix Inc → Worland 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:** Mc Cormac Redi-Mix → Worland Wash Plant; 1950-01-01 to 1994-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Mc Cormac Redi-Mix → Worland Wash Plant; 1950-01-01 to 1994-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Mc Cormac Redi-Mix → Mc Cormac Redi-Mix; 1950-01-01 to 1994-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Big Horn Redi-Mix Inc → Worland Wash Plant; 1994-10-01 to 1999-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Monroc Inc → Worland Wash Plant; 1994-10-01 to 1999-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Monroc Inc → Big Horn Redi-Mix Inc; 1994-10-01 to 1999-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Big Horn Redi-Mix Inc → Worland Wash Plant; 1999-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raymond W  DeVries → Worland 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