# Relationship history for MSHA mine 4604489

Current hierarchy: **Antulov Martin → A & H Coal Co Inc → Bailey & Righter 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:** Antulov Martin → Bailey & Righter Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A & H Coal Co Inc → Bailey & Righter Mine; 1974-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Antulov Martin → A & H Coal Co Inc; 1974-12-01 to current/open; source msha-controller-operator-history