# Relationship history for MSHA mine 2601895

Current hierarchy: **Marvin  Aslett → Circle A Construction Mining & Milling → Big Ledge 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

- **operator_operates_mine:** Circle A Construction Mining & Milling → Big Ledge Mine; 1984-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marvin  Aslett → Big Ledge Mine; 1984-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin  Aslett → Circle A Construction Mining & Milling; 1984-07-01 to current/open; source msha-controller-operator-history