# Relationship history for MSHA mine 3609469

Current hierarchy: **Rob  Holland → Rob Holland Enterprise → Clearfield County Strips**

- 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:** Rob Holland Enterprise → Clearfield County Strips; 2006-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rob  Holland → Clearfield County Strips; 2006-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rob  Holland → Rob Holland Enterprise; 2006-09-01 to current/open; source msha-controller-operator-history