# Relationship history for MSHA mine 3606355

Current hierarchy: **Naugle Floyd → Onyx Mining Inc → Onyx Mining Inc Strip**

- 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:** Onyx Mining Inc → Onyx Mining Inc Strip; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Naugle Floyd → Onyx Mining Inc Strip; 1977-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Naugle Floyd → Onyx Mining Inc; 1977-03-01 to current/open; source msha-controller-operator-history