# Relationship history for MSHA mine 3502376

Current hierarchy: **Robert G  Wienert → Cedar Creek Quarries, Inc → Cedar Creek Quarries Inc-Fischer 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Oceanlake Sand & Gravel → Cedar Creek Quarries Inc-Fischer Pit; 1950-01-01 to 1989-04-17; source msha-controller-operator-history
- **controller_controls_mine:** T W  Cowgill → Cedar Creek Quarries Inc-Fischer Pit; 1950-01-01 to 1989-04-17; source msha-controller-operator-history
- **controller_controls_operator:** T W  Cowgill → Oceanlake Sand & Gravel; 1950-01-01 to 1989-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Robert G  Wienert → Cedar Creek Quarries Inc-Fischer Pit; 1984-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cedar Creek Quarries, Inc → Cedar Creek Quarries Inc-Fischer Pit; 1989-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert G  Wienert → Cedar Creek Quarries, Inc; 1989-04-18 to current/open; source msha-controller-operator-history