# Relationship history for MSHA mine 4201972

Current hierarchy: **David  Lewis → Foss Lewis Sand & Gravel Inc → BENTON 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** David  Lewis et al → BENTON PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Foss Lewis Sand & Gravel Inc → BENTON PIT; 1986-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Lewis et al → Foss Lewis Sand & Gravel Inc; 1986-04-01 to current/open; source msha-controller-operator-history