# Relationship history for MSHA mine 0202614

Current hierarchy: **Omya Industries Inc → Omya Inc → Omya Arizona**

- 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:** Mineral Development Inc → Omya Arizona; 1993-10-01 to 1997-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Laurence U  Turley → Omya Arizona; 1993-10-01 to 1997-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Laurence U  Turley → Mineral Development Inc; 1993-10-01 to 1997-06-19; source msha-controller-operator-history
- **operator_operates_mine:** Mineral Development Inc → Omya Arizona; 1997-06-20 to 1997-09-15; source msha-controller-operator-history
- **controller_controls_mine:** Gary T  Smith et al → Omya Arizona; 1997-06-20 to 1997-09-15; source msha-controller-operator-history
- **controller_controls_operator:** Gary T  Smith et al → Mineral Development Inc; 1997-06-20 to 1997-09-15; source msha-controller-operator-history
- **operator_operates_mine:** Omya Arizona Inc → Omya Arizona; 1997-09-16 to 2009-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Omya Industries Inc → Omya Arizona; 1997-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Omya Industries Inc → Omya Arizona Inc; 1997-09-16 to 2009-01-27; source msha-controller-operator-history
- **controller_controls_mine:** Omya Industries Inc → Omya Arizona; 2009-01-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Omya Inc → Omya Arizona; 2009-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Omya Industries Inc → Omya Inc; 2009-01-28 to current/open; source msha-controller-operator-history