# Relationship history for MSHA mine 1516245

Current hierarchy: **Smith Curt-James Harris → S H M Coal Company → No 1 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

- **operator_operates_mine:** S H M Coal Company → No 1 Surface; 1987-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Curt-James Harris Et Al → No 1 Surface; 1987-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Curt-James Harris Et Al → S H M Coal Company; 1987-11-01 to current/open; source msha-controller-operator-history