# Relationship history for MSHA mine 2402637

Current hierarchy: **Jeffrey E  Frank → Advanced Resource Technologies Art LLC → Pittsburg Placer MMC 7391**

- 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

- **operator_operates_mine:** Advanced Resource Technologies Art LLC → Pittsburg Placer MMC 7391; 2012-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey E  Frank et al → Pittsburg Placer MMC 7391; 2012-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey E  Frank et al → Advanced Resource Technologies Art LLC; 2012-08-15 to current/open; source msha-controller-operator-history