# Relationship history for MSHA mine 1100073

Current hierarchy: **Todd H  Miller → Gray Quarries Inc → Gray Quarries Inc**

- 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:** Gray Quarries Inc → Gray Quarries Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Todd H  Miller et al → Gray Quarries Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd H  Miller et al → Gray Quarries Inc; 1950-01-01 to current/open; source msha-controller-operator-history