# Relationship history for MSHA mine 2300109

Current hierarchy: **Howard Olen → Howard Quarries Inc → Miami Quarry No 34**

- 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:** Howard Quarries Inc → Miami Quarry No 34; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Howard Olen → Miami Quarry No 34; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howard Olen → Howard Quarries Inc; 1950-01-01 to current/open; source msha-controller-operator-history