# Relationship history for MSHA mine 4202093

Current hierarchy: **Exelon Corporation; ACI (American Consumer Industries Inc) → SUNNYSIDE COGENERATION ASSOCIATES → SUNNYSIDE WASTE COAL SITE**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Savage Industries Inc → SUNNYSIDE WASTE COAL SITE; 1993-08-01 to 1997-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Savage Companies → SUNNYSIDE WASTE COAL SITE; 1993-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Savage Companies → Savage Industries Inc; 1993-08-01 to 1997-07-30; source msha-controller-operator-history
- **operator_operates_mine:** Sunnyside Cogeneration Associates → SUNNYSIDE WASTE COAL SITE; 1997-07-31 to 2000-01-18; source msha-controller-operator-history
- **controller_controls_mine:** Northern States Power Co et al → SUNNYSIDE WASTE COAL SITE; 1997-07-31 to 2000-01-18; source msha-controller-operator-history
- **controller_controls_operator:** Northern States Power Co et al → Sunnyside Cogeneration Associates; 1997-07-31 to 2000-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Sunnyside Cogeneration Associates → SUNNYSIDE WASTE COAL SITE; 2000-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Exelon Corporation et al → SUNNYSIDE WASTE COAL SITE; 2000-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Exelon Corporation et al → Sunnyside Cogeneration Associates; 2000-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** ACI (American Consumer Industries Inc) et al → Sunnyside Cogeneration Associates; 2000-01-19 to current/open; source msha-controller-operator-history