# Relationship history for MSHA mine 3004168

Current hierarchy: **Gerry G  Beckwith; Sherrie M  Beckwith → Sk Gravel Products → Sk Crusher**

- 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:** Sk Gravel Products → Sk Crusher; 2025-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sherrie M  Beckwith → Sk Crusher; 2025-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sherrie M  Beckwith → Sk Gravel Products; 2025-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerry G  Beckwith → Sk Gravel Products; 2025-09-09 to current/open; source msha-controller-operator-history