# Relationship history for MSHA mine 1600395

Current hierarchy: **H H  Holloway Jr → Monroe Sand & Gravel Company Inc → Perryville Plant No 5 & 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

- **operator_operates_mine:** Monroe Sand & Gravel Company Inc → Perryville Plant No 5 & Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** H H  Holloway Jr → Perryville Plant No 5 & Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H H  Holloway Jr → Monroe Sand & Gravel Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history