# Relationship history for MSHA mine 2402709

Current hierarchy: **Darwin D Pluid → Rocky Mountain Gravel, Inc. → Rocky Mountain Gravel**

- 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:** Rocky Mountain Gravel, Inc. → Rocky Mountain Gravel; 2017-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darwin D Pluid → Rocky Mountain Gravel; 2017-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darwin D Pluid → Rocky Mountain Gravel, Inc.; 2017-03-30 to current/open; source msha-controller-operator-history