# Relationship history for MSHA mine 3609600

Current hierarchy: **Vincent  Guarna; Michael  Guarna → Fox Coal Co., Inc. → Fox Coal Co. #1**

- 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

- **controller_controls_mine:** Michael  Guarna et al → Fox Coal Co. #1; 2006-10-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fox Coal Co., Inc. → Fox Coal Co. #1; 2008-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Guarna et al → Fox Coal Co., Inc.; 2008-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vincent  Guarna et al → Fox Coal Co., Inc.; 2008-03-19 to current/open; source msha-controller-operator-history