# Relationship history for MSHA mine 3003909

Current hierarchy: **Mario  Sanchez; Enrique  Salinas → S & S Stone Distribution → S & S Stone Distribution**

- 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 & S Stone Distribution → S & S Stone Distribution; 2014-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Enrique  Salinas et al → S & S Stone Distribution; 2014-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Enrique  Salinas et al → S & S Stone Distribution; 2014-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mario  Sanchez et al → S & S Stone Distribution; 2014-04-30 to current/open; source msha-controller-operator-history