# Relationship history for MSHA mine 3501430

Current hierarchy: **Hill Lloyd M Inc → Lloyd M Hill Inc → Red Rock 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Hill Lloyd M Inc → Red Rock Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** U S Forest Service → Red Rock Pit; 1950-01-01 to 1979-08-19; source msha-controller-operator-history
- **controller_controls_mine:** United States Government → Red Rock Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United States Government → U S Forest Service; 1950-01-01 to 1979-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Lloyd M Hill Inc → Red Rock Pit; 1979-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hill Lloyd M Inc → Lloyd M Hill Inc; 1979-08-20 to current/open; source msha-controller-operator-history