# Relationship history for MSHA mine 3607647

Current hierarchy: **Vincent  Guarna; Michael  Guarna → Atlas Coal Sales Inc → St Nick 42a Silt**

- 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

- **operator_operates_mine:** Atlas Coal Sales Inc → St Nick 42a Silt; 1985-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Guarna et al → St Nick 42a Silt; 1985-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Guarna et al → Atlas Coal Sales Inc; 1985-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vincent  Guarna et al → Atlas Coal Sales Inc; 1985-01-01 to current/open; source msha-controller-operator-history