# Relationship history for MSHA mine 1519320

Current hierarchy: **Paul C  Combs; Shirley W  Combs → Johnson Floyd Coal Company LLC → Muddy Branch #1 Surface**

- 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:** Paul C  Combs et al → Muddy Branch #1 Surface; 2004-01-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Floyd Coal Company LLC → Muddy Branch #1 Surface; 2008-09-29 to 2008-12-17; source msha-controller-operator-history
- **controller_controls_operator:** Paul C  Combs et al → Johnson Floyd Coal Company LLC; 2008-09-29 to 2008-12-17; source msha-controller-operator-history
- **controller_controls_operator:** Shirley W  Combs et al → Johnson Floyd Coal Company LLC; 2008-09-29 to 2008-12-17; source msha-controller-operator-history
- **operator_operates_mine:** S M Construction → Muddy Branch #1 Surface; 2008-12-18 to 2009-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Steve C  Davis et al → Muddy Branch #1 Surface; 2008-12-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve C  Davis et al → S M Construction; 2008-12-18 to 2009-06-15; source msha-controller-operator-history
- **controller_controls_operator:** (Wm) Mike  Davis et al → S M Construction; 2008-12-18 to 2009-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Johnson Floyd Coal Company LLC → Muddy Branch #1 Surface; 2009-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul C  Combs et al → Johnson Floyd Coal Company LLC; 2009-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shirley W  Combs et al → Johnson Floyd Coal Company LLC; 2009-06-16 to current/open; source msha-controller-operator-history