# Relationship history for MSHA mine 3800210

Current hierarchy: **Larry  Forsell → Foster-Dixiana Sand Inc → Silica Pit**

- 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:** Foster-Dixiana Sand Inc → Silica Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Forsell  et al → Silica Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Forsell  et al → Foster-Dixiana Sand Inc; 1950-01-01 to current/open; source msha-controller-operator-history