# Relationship history for MSHA mine 1103195

Current hierarchy: **Stan  Duesterhaus; Betsy  Hendricks → Sangamon  Valley Sand and Gravel LLC. → Sangamon Valley Sand & Gravel**

- 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:** Sangamon  Valley Sand and Gravel LLC. → Sangamon Valley Sand & Gravel; 2008-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stan  Duesterhaus et al → Sangamon Valley Sand & Gravel; 2008-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stan  Duesterhaus et al → Sangamon  Valley Sand and Gravel LLC.; 2008-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Betsy  Hendricks et al → Sangamon  Valley Sand and Gravel LLC.; 2008-07-09 to current/open; source msha-controller-operator-history