# Relationship history for MSHA mine 3609026

Current hierarchy: **Robert  Cooley → Robert Cooley → Norville 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:** J-J Flagstone → Norville Quarry; 2001-09-20 to 2009-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Jade  Brewer → Norville Quarry; 2001-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jade  Brewer → J-J Flagstone; 2001-09-20 to 2009-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Mick Herman → Norville Quarry; 2009-06-16 to 2009-11-23; source msha-controller-operator-history
- **controller_controls_mine:** Mick L  Herman → Norville Quarry; 2009-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mick L  Herman → Mick Herman; 2009-06-16 to 2009-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Robert Cooley → Norville Quarry; 2009-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Cooley → Norville Quarry; 2009-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Cooley → Robert Cooley; 2009-11-24 to current/open; source msha-controller-operator-history