# Relationship history for MSHA mine 1513152

Current hierarchy: **Austin Bill & W C Forrester → Virginia-Lee Coal Company → Number Two**

- 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:** Austin Bill & W C Forrester → Number Two; 1980-04-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Virginia-Lee Coal Company → Number Two; 1981-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Austin Bill & W C Forrester → Virginia-Lee Coal Company; 1981-10-01 to current/open; source msha-controller-operator-history