# Relationship history for MSHA mine 3800183

Current hierarchy: **Baxley George C Jr → Williams Sand & Gravel Company → Williams 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:** Gene Williams Sand Company → Williams Sand Pit; 1950-01-01 to 1981-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Williams Mildred & Gene → Williams Sand Pit; 1950-01-01 to 1981-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Williams Mildred & Gene → Gene Williams Sand Company; 1950-01-01 to 1981-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Williams Sand & Gravel Company → Williams Sand Pit; 1981-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Baxley George C Jr → Williams Sand Pit; 1981-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Baxley George C Jr → Williams Sand & Gravel Company; 1981-02-18 to current/open; source msha-controller-operator-history