# Relationship history for MSHA mine 1512410

Current hierarchy: **Evans Billy P → Coal Diggers Inc → Coal Diggers Inc Mine 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Evans Billy P → Coal Diggers Inc Mine No 1; 1979-07-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal Diggers Inc → Coal Diggers Inc Mine No 1; 1980-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Evans Billy P → Coal Diggers Inc; 1980-06-01 to current/open; source msha-controller-operator-history