# Relationship history for MSHA mine 4605501

Current hierarchy: **Akers Robert & Robert R--Brady Adams → Beth Ann Coal Company → No 1**

- 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:** Beth Ann Coal Company → No 1; 1977-04-01 to 1977-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Ball Dwight → No 1; 1977-04-01 to 1977-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Ball Dwight → Beth Ann Coal Company; 1977-04-01 to 1977-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Beth Ann Coal Company → No 1; 1977-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Akers Robert & Robert R--Brady Adams → No 1; 1977-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Akers Robert & Robert R--Brady Adams → Beth Ann Coal Company; 1977-05-10 to current/open; source msha-controller-operator-history