# Relationship history for MSHA mine 2902259

Current hierarchy: **Fred H  Salls → Salls Brothers Construction, Inc → Salls Portable Mine #2**

- 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:** Fred H  Salls → Salls Portable Mine #2; 2002-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Salls Brothers Construction, Inc → Salls Portable Mine #2; 2003-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred H  Salls → Salls Brothers Construction, Inc; 2003-12-01 to current/open; source msha-controller-operator-history