# Relationship history for MSHA mine 3503710

Current hierarchy: **Joy  Foss → Cinder Butte Rock Products → Cinder Butte Rock Products # 2**

- 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:** Joy  Foss  et al → Cinder Butte Rock Products # 2; 2001-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cinder Butte Rock Products → Cinder Butte Rock Products # 2; 2008-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joy  Foss  et al → Cinder Butte Rock Products; 2008-11-03 to current/open; source msha-controller-operator-history