# Relationship history for MSHA mine 3503083

Current hierarchy: **Hand Claude → Elkhorn Mining & Minerals Corp → Granite 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Hand Claude → Granite Mine; 1981-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Elkhorn Mining & Minerals Corp → Granite Mine; 1981-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hand Claude → Elkhorn Mining & Minerals Corp; 1981-07-01 to current/open; source msha-controller-operator-history