# Relationship history for MSHA mine 3609348

Current hierarchy: **John L  Foieri; Matthew A  Guarna → Last Time Coal → Crystal Strip**

- 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:** Last Time Coal Co. → Crystal Strip; 2005-07-01 to 2010-10-05; source msha-controller-operator-history
- **controller_controls_mine:** Ricky G  Derck et al → Crystal Strip; 2005-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ricky G  Derck et al → Last Time Coal Co.; 2005-07-01 to 2010-10-05; source msha-controller-operator-history
- **operator_operates_mine:** Last Time Coal → Crystal Strip; 2010-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John L  Foieri et al → Crystal Strip; 2010-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John L  Foieri et al → Last Time Coal; 2010-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew A  Guarna et al → Last Time Coal; 2010-10-06 to current/open; source msha-controller-operator-history