# Relationship history for MSHA mine 4604726

Current hierarchy: **Adkins James H → A M Y Coal Inc → No 2 Surface**

- 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:** Adkins James H → No 2 Surface; 1975-02-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A M Y Coal Inc → No 2 Surface; 1975-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Adkins James H → A M Y Coal Inc; 1975-09-29 to current/open; source msha-controller-operator-history