# Relationship history for MSHA mine 2901002

Current hierarchy: **George M  Oringdulph → Colorado Aggregate Company Inc → San Anton Mountain Pit**

- 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:** Colorado Aggregate Company Inc → San Anton Mountain Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George M  Oringdulph → San Anton Mountain Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** George M  Oringdulph → Colorado Aggregate Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history