# Relationship history for MSHA mine 1202412

Current hierarchy: **Buzzi S p A → Buzzi Unicem USA → Berry Shale**

- 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:** Dyckerhoff AG → Berry Shale; 1999-10-04 to 2003-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Buzzi S p A → Berry Shale; 2004-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dennie A  McGuire → Berry Shale; 2007-10-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** McGuire Excavating & Trucking Inc. → Berry Shale; 2008-08-12 to 2019-05-20; source msha-controller-operator-history
- **controller_controls_operator:** Dennie A  McGuire → McGuire Excavating & Trucking Inc.; 2008-08-12 to 2019-05-20; source msha-controller-operator-history
- **operator_operates_mine:** Buzzi Unicem USA → Berry Shale; 2019-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buzzi S p A → Buzzi Unicem USA; 2019-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dyckerhoff AG → Buzzi Unicem USA; 2019-05-21 to 2003-12-31; source msha-controller-operator-history