# Relationship history for MSHA mine 3607803

Current hierarchy: **Vincent  Guarna; Michael  Guarna → Mid-Valley Coal Sales Inc → Shamokin Stripping**

- 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:** Muscara D B & F G Roehrig → Shamokin Stripping; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & F Coal Company → Shamokin Stripping; 1986-05-01 to 1998-05-28; source msha-controller-operator-history
- **controller_controls_operator:** Muscara D B & F G Roehrig → D & F Coal Company; 1986-05-01 to 1998-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Kleeman  et al → Shamokin Stripping; 1996-02-01 to 2013-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Mid-Valley Coal Sales Inc → Shamokin Stripping; 1998-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Kleeman  et al → Mid-Valley Coal Sales Inc; 1998-05-29 to 2013-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Vincent  Guarna et al → Shamokin Stripping; 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 current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Guarna et al → Mid-Valley Coal Sales Inc; 2013-09-17 to current/open; source msha-controller-operator-history