# Relationship history for MSHA mine 1519478

Current hierarchy: **Larry  Thornsberry → PIA Company, Inc. → #6**

- 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:** Larry  Thornsberry et al → #6; 1982-06-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** PIA Company, Inc. → #6; 2010-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Thornsberry et al → PIA Company, Inc.; 2010-03-25 to current/open; source msha-controller-operator-history