# Relationship history for MSHA mine 4202476

Current hierarchy: **Robert  Cowley; Douglas  Cowley → HOG Sand & Gravel LLC → HOG Mobile 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** HOG Sand & Gravel LLC → HOG Mobile 1; 2007-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Cowley et al → HOG Mobile 1; 2007-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Cowley et al → HOG Sand & Gravel LLC; 2007-05-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Cowley et al → HOG Sand & Gravel LLC; 2007-05-22 to current/open; source msha-controller-operator-history