# Relationship history for MSHA mine 3609231

Current hierarchy: **Vincent  Guarna; Michael  Guarna → Fox Coal Company Inc. → Zerbe 10 Mine**

- 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:** Joseph  Kleeman  et al → Zerbe 10 Mine; 1996-02-01 to 2013-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Mid-Valley Coal Sales Inc. → Zerbe 10 Mine; 2004-04-25 to 2007-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Kleeman  et al → Mid-Valley Coal Sales Inc.; 2004-04-25 to 2007-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Guarna et al → Zerbe 10 Mine; 2006-10-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fox Coal Company Inc. → Zerbe 10 Mine; 2007-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Guarna et al → Fox Coal Company Inc.; 2007-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vincent  Guarna et al → Fox Coal Company Inc.; 2007-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vincent  Guarna et al → Zerbe 10 Mine; 2013-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vincent  Guarna et al → Mid-Valley Coal Sales Inc.; 2013-09-17 to 2007-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Guarna et al → Mid-Valley Coal Sales Inc.; 2013-09-17 to 2007-11-14; source msha-controller-operator-history