# Relationship history for MSHA mine 2902288

Current hierarchy: **Russell P  Casados; Mary Alice  Casados → Russell Sand & Gravel Company Inc → Portable Crusher #1**

- 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

- **controller_controls_mine:** Mary Alice  Casados et al → Portable Crusher #1; 2000-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Russell Sand & Gravel Company Inc → Portable Crusher #1; 2005-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mary Alice  Casados et al → Russell Sand & Gravel Company Inc; 2005-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russell P  Casados et al → Russell Sand & Gravel Company Inc; 2005-08-11 to current/open; source msha-controller-operator-history