# Relationship history for MSHA mine 1302298

Current hierarchy: **William Earl  Osterkamp → C & R Gravel Inc → C & R Gravel Inc**

- 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:** C & R Gravel → C & R Gravel Inc; 2005-04-25 to 2006-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Russell LeRoy  Osterkamp → C & R Gravel Inc; 2005-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russell LeRoy  Osterkamp → C & R Gravel; 2005-04-25 to 2006-06-30; source msha-controller-operator-history
- **operator_operates_mine:** C & R Gravel Inc → C & R Gravel Inc; 2006-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Russell LeRoy  Osterkamp → C & R Gravel Inc; 2006-07-01 to 2024-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Russell LeRoy  Osterkamp → C & R Gravel Inc; 2006-07-01 to 2024-12-31; source msha-controller-operator-history
- **controller_controls_mine:** William Earl  Osterkamp → C & R Gravel Inc; 2025-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William Earl  Osterkamp → C & R Gravel Inc; 2025-01-01 to current/open; source msha-controller-operator-history