# Relationship history for MSHA mine 4605013

Current hierarchy: **Adkins Buhl → B A Coal Company → No 1 Surface 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:** B A Coal Company → No 1 Surface Mine; 1975-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Adkins Buhl → No 1 Surface Mine; 1975-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adkins Buhl → B A Coal Company; 1975-11-01 to current/open; source msha-controller-operator-history