# Relationship history for MSHA mine 3609125

Current hierarchy: **Timothy M  Smith → B S Quarries Inc → BSQ II**

- 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

- **controller_controls_mine:** Timothy M  Smith → BSQ II; 1997-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Norman & Tammy Norton → BSQ II; 2003-01-08 to 2005-06-05; source msha-controller-operator-history
- **controller_controls_mine:** Tammy L  Norton → BSQ II; 2003-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tammy L  Norton → Norman & Tammy Norton; 2003-01-08 to 2005-06-05; source msha-controller-operator-history
- **operator_operates_mine:** B S Quarries Inc → BSQ II; 2005-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy M  Smith → B S Quarries Inc; 2005-06-06 to current/open; source msha-controller-operator-history