# Relationship history for MSHA mine 3608971

Current hierarchy: **Dale G  Webster → Dale G Webster → GENERATIONS QUARRY**

- 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:** Dale G Webster → GENERATIONS QUARRY; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dale G  Webster → GENERATIONS QUARRY; 2001-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dale G  Webster → Dale G Webster; 2001-03-01 to current/open; source msha-controller-operator-history