# Relationship history for MSHA mine 4402884

Current hierarchy: **Booth Robert N → R N Booth & Son Inc → R N Booth Sand Pit Callo 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:** R N Booth & Son Inc → R N Booth Sand Pit Callo Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Booth Robert N Et Al → R N Booth Sand Pit Callo Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Booth Robert N Et Al → R N Booth & Son Inc; 1950-01-01 to current/open; source msha-controller-operator-history