# Relationship history for MSHA mine 0404956

Current hierarchy: **Skanska AB → E L Yeager Construction Company Inc → Crestmore Plant**

- 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) → Crestmore Plant; 1979-01-01 to 2003-08-31; source msha-controller-operator-history
- **operator_operates_mine:** E L Yeager Construction Company Inc → Crestmore Plant; 1988-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Yeager Jacques S (Jack) → E L Yeager Construction Company Inc; 1988-04-01 to 2003-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Skanska AB → Crestmore Plant; 2002-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Skanska AB → E L Yeager Construction Company Inc; 2002-09-01 to current/open; source msha-controller-operator-history