# Relationship history for MSHA mine 3610325

Current hierarchy: **Tyler N  Herbert → Tyler Herbert Stone → Herbert 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Tyler Herbert Stone → Herbert Quarry; 2020-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tyler N  Herbert → Herbert Quarry; 2020-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tyler N  Herbert → Tyler Herbert Stone; 2020-03-10 to current/open; source msha-controller-operator-history