# Relationship history for MSHA mine 2402173

Current hierarchy: **Mike P  White; Val B  White → Nelcon Inc → Spomac/Fabtech Wash Plant #4050**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Nelcon Inc → Spomac/Fabtech Wash Plant #4050; 1999-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eichert Gary → Spomac/Fabtech Wash Plant #4050; 1999-05-01 to 2003-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Eichert Gary → Nelcon Inc; 1999-05-01 to 2003-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Mike P  White et al → Spomac/Fabtech Wash Plant #4050; 2003-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike P  White et al → Nelcon Inc; 2003-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Val B  White et al → Nelcon Inc; 2003-07-01 to current/open; source msha-controller-operator-history