# Relationship history for MSHA mine 1513287

Current hierarchy: **Anglo-American Mining Inc → Brooks & Sizemore Coal Company Inc → No 4 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:** Anglo-American Mining Inc → No 4 Surface; 1981-07-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brooks & Sizemore Coal Company Inc → No 4 Surface; 1982-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anglo-American Mining Inc → Brooks & Sizemore Coal Company Inc; 1982-01-01 to current/open; source msha-controller-operator-history