# Relationship history for MSHA mine 3503750

Current hierarchy: **Herbert A  Smith; Floyd D  Smith → Edson Creek Rock Products → Edson Creek Quarry**

- 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

- **operator_operates_mine:** Edson Creek Rock Products → Edson Creek Quarry; 2010-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Floyd D  Smith et al → Edson Creek Quarry; 2010-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Floyd D  Smith et al → Edson Creek Rock Products; 2010-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Herbert A  Smith et al → Edson Creek Rock Products; 2010-07-14 to current/open; source msha-controller-operator-history