# Relationship history for MSHA mine 0504853

Current hierarchy: **Andrew  Kagan; Rebecca  Kagan → Kagan & Son LLC → Portable Screening Plant**

- 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:** Rock Bottom, LLC → Portable Screening Plant; 2006-08-29 to 2007-04-30; source msha-controller-operator-history
- **controller_controls_mine:** David  Martin et al → Portable Screening Plant; 2006-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Martin et al → Rock Bottom, LLC; 2006-08-29 to 2007-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Russel et al → Rock Bottom, LLC; 2006-08-29 to 2007-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Kagan & Son LLC → Portable Screening Plant; 2007-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rebecca  Kagan et al → Portable Screening Plant; 2007-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rebecca  Kagan et al → Kagan & Son LLC; 2007-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew  Kagan et al → Kagan & Son LLC; 2007-05-01 to current/open; source msha-controller-operator-history