# Relationship history for MSHA mine 4202477

Current hierarchy: **Doug  Rogers; Colby  Seely → Rogers Rock,  LLC → Snow Field Rock Products**

- 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:** Rogers Rock LLC. → Snow Field Rock Products; 2007-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Doug  Rogers et al → Snow Field Rock Products; 2007-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Doug  Rogers et al → Rogers Rock LLC.; 2007-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Colby  Seely et al → Rogers Rock LLC.; 2007-05-24 to current/open; source msha-controller-operator-history