# Relationship history for MSHA mine 4801892

Current hierarchy: **Raymond W  DeVries → BIG HORN REDI MIX, INC. → MOLNAR 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 → MOLNAR PIT; 1999-05-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** BIG HORN REDI MIX, INC. → MOLNAR PIT; 2025-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond W  DeVries → BIG HORN REDI MIX, INC.; 2025-01-16 to current/open; source msha-controller-operator-history