# Relationship history for MSHA mine 0302036

Current hierarchy: **Bill  Bogle → Cedar Ridge Quarries → Cedar Ridge Quarries**

- 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:** Jeff  Byler → Cedar Ridge Quarries; 2009-06-09 to 2014-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Cedar Ridge Quarries → Cedar Ridge Quarries; 2012-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Byler → Cedar Ridge Quarries; 2012-12-07 to 2014-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Bogle → Cedar Ridge Quarries; 2014-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Bogle → Cedar Ridge Quarries; 2014-10-15 to current/open; source msha-controller-operator-history