# Relationship history for MSHA mine 0404962

Current hierarchy: **Skanska AB → Skanska USA Civil West California District Inc. → Plant A**

- 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:** Yeager Jacques S (Jack) → Plant A; 1979-01-01 to 2003-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Skanska → Plant A; 1988-08-01 to 2008-11-20; source msha-controller-operator-history
- **controller_controls_operator:** Yeager Jacques S (Jack) → Skanska; 1988-08-01 to 2003-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Skanska AB → Plant A; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Skanska AB → Plant A; 2002-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Skanska AB → Skanska; 2002-09-01 to 2008-11-20; source msha-controller-operator-history
- **operator_operates_mine:** Skanska USA Civil West California District Inc. → Plant A; 2008-11-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Skanska AB → Skanska USA Civil West California District Inc.; 2008-11-21 to current/open; source msha-controller-operator-history