# Relationship history for MSHA mine 1001424

Current hierarchy: **Snow G G & Don H Adair → Humboldt Associates Ltd → Humbolt 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:** Humboldt Associates Ltd → Humbolt Mine; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Snow G G & Don H Adair → Humbolt Mine; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Snow G G & Don H Adair → Humboldt Associates Ltd; 1979-01-01 to current/open; source msha-controller-operator-history