# Relationship history for MSHA mine 1202389

Current hierarchy: **William N  Rich → Lakeside Synfuel, LLC → Somerville South Synfuel Plant**

- 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

- **controller_controls_mine:** William N  Rich → Somerville South Synfuel Plant; 2001-12-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lakeside Synfuel, LLC → Somerville South Synfuel Plant; 2006-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William N  Rich → Lakeside Synfuel, LLC; 2006-04-20 to current/open; source msha-controller-operator-history