# Relationship history for MSHA mine 4801722

Current hierarchy: **Raymond W  DeVries → Big Horn Redi Mix Inc → Willy 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

- **controller_controls_mine:** Raymond W  DeVries → Willy Pit; 1999-05-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Horn Redi Mix Inc → Willy Pit; 2007-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond W  DeVries → Big Horn Redi Mix Inc; 2007-10-16 to current/open; source msha-controller-operator-history