# Relationship history for MSHA mine 4002053

Current hierarchy: **Allen Thomas → Allen Coal Company → No 3 Strip**

- 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:** Allen Thomas → No 3 Strip; 1975-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Allen Coal Company → No 3 Strip; 1976-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Allen Thomas → Allen Coal Company; 1976-05-01 to current/open; source msha-controller-operator-history