# Relationship history for MSHA mine 1518545

Current hierarchy: **Vicki  Salyer → Labco, LLC → No. 12**

- 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:** Vicki  Salyer et al → No. 12; 1999-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Labco, LLC → No. 12; 2002-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vicki  Salyer et al → Labco, LLC; 2002-05-10 to current/open; source msha-controller-operator-history