# Relationship history for MSHA mine 1512611

Current hierarchy: **Justice Stanley → Helena Coal Company → No 13-A (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:** Justice Stanley Et Al → No 13-A (Surface); 1977-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Helena Coal Company → No 13-A (Surface); 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justice Stanley Et Al → Helena Coal Company; 1980-11-01 to current/open; source msha-controller-operator-history