# Relationship history for MSHA mine 2401764

Current hierarchy: **Palmer Marvin → Thunder Ridge Mines → High Ridge 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:** Gold Ridge Mining Company → High Ridge Mine; 1984-05-01 to 1989-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Guay George E → High Ridge Mine; 1984-05-01 to 1989-10-01; source msha-controller-operator-history
- **controller_controls_operator:** Guay George E → Gold Ridge Mining Company; 1984-05-01 to 1989-10-01; source msha-controller-operator-history
- **operator_operates_mine:** Thunder Ridge Mines → High Ridge Mine; 1989-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Palmer Marvin → High Ridge Mine; 1989-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Palmer Marvin → Thunder Ridge Mines; 1989-10-02 to current/open; source msha-controller-operator-history