# Relationship history for MSHA mine 1102966

Current hierarchy: **Buzzi S p A → Buzzi Unicem USA → Lonestar Industries Inc**

- 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:** Massac Materials Corp → Lonestar Industries Inc; 1994-08-01 to 2007-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Buzbee Ken → Lonestar Industries Inc; 1994-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buzbee Ken → Massac Materials Corp; 1994-08-01 to 2007-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Dyckerhoff AG → Lonestar Industries Inc; 1999-10-04 to 2003-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Buzzi S p A → Lonestar Industries Inc; 2004-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Teko Minerals LLC → Lonestar Industries Inc; 2007-06-25 to 2008-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Walter T  Ozee → Lonestar Industries Inc; 2007-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walter T  Ozee → Teko Minerals LLC; 2007-06-25 to 2008-02-07; source msha-controller-operator-history
- **operator_operates_mine:** Buzzi Unicem USA → Lonestar Industries Inc; 2008-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buzzi S p A → Buzzi Unicem USA; 2008-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dyckerhoff AG → Buzzi Unicem USA; 2008-02-08 to 2003-12-31; source msha-controller-operator-history