# Relationship history for MSHA mine 4800274

Current hierarchy: **Raymond W  DeVries → Big Horn Redi-Mix Inc → CODY LUMBER 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:** Cody Concrete Inc → CODY LUMBER PIT; 1950-01-01 to 1993-04-30; source msha-controller-operator-history
- **controller_controls_mine:** C L  Frazier → CODY LUMBER PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C L  Frazier → Cody Concrete Inc; 1950-01-01 to 1993-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Cody Concrete Inc → CODY LUMBER PIT; 1993-05-01 to 1995-06-22; source msha-controller-operator-history
- **controller_controls_mine:** R David  Walton → CODY LUMBER PIT; 1993-05-01 to 1995-06-22; source msha-controller-operator-history
- **controller_controls_operator:** R David  Walton → Cody Concrete Inc; 1993-05-01 to 1995-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Monroc Inc → CODY LUMBER PIT; 1994-10-01 to 1999-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Big Horn Redi-Mix Inc → CODY LUMBER PIT; 1995-06-23 to 1999-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Monroc Inc → Big Horn Redi-Mix Inc; 1995-06-23 to 1999-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Big Horn Redi-Mix Inc → CODY LUMBER PIT; 1999-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raymond W  DeVries → CODY LUMBER PIT; 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