# Relationship history for MSHA mine 2103818

Current hierarchy: **Dorothy  Bennett → Bennett & Sons Sand & Gravel Co. → Elgin Sand 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:** Bennett & Sons Sand & Gravel Co. → Elgin Sand Pit; 2014-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dorothy  Bennett et al → Elgin Sand Pit; 2014-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dorothy  Bennett et al → Bennett & Sons Sand & Gravel Co.; 2014-04-15 to current/open; source msha-controller-operator-history