# Relationship history for MSHA mine 1101343

Current hierarchy: **S F  Brown → Southern Illinois Sand Company Inc → SOUTHERN ILLINOIS SAND CO., INC.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Southern Illinois Sand Company Inc → SOUTHERN ILLINOIS SAND CO., INC.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** S F  Brown → SOUTHERN ILLINOIS SAND CO., INC.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** S F  Brown → Southern Illinois Sand Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history