# Relationship history for MSHA mine 0404547

Current hierarchy: **Mc Leod Donald W → Alaskan Peak Mining Company → Grizzley Peak Mine**

- 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:** Alaskan Peak Mining Company → Grizzley Peak Mine; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Leod Donald W → Grizzley Peak Mine; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Leod Donald W → Alaskan Peak Mining Company; 1981-10-01 to current/open; source msha-controller-operator-history