# Relationship history for MSHA mine 2500341

Current hierarchy: **Bowman Gene → Kimball Sand & Gravel Inc → Kimball Sand And Gravel Pits And Pl**

- 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:** Kimball Sand & Gravel Inc → Kimball Sand And Gravel Pits And Pl; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bowman Gene → Kimball Sand And Gravel Pits And Pl; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bowman Gene → Kimball Sand & Gravel Inc; 1950-01-01 to current/open; source msha-controller-operator-history