# Relationship history for MSHA mine 4200093

Current hierarchy: **Exelon Corporation; ACI (American Consumer Industries Inc) → Sunnyside Cogeneration Assoc. → SCA Manshaft Water Well**

- 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:** Kaiser Coal Corp → SCA Manshaft Water Well; 1950-01-01 to 1988-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Kaiser Steel Corp → SCA Manshaft Water Well; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kaiser Steel Corp → Kaiser Coal Corp; 1950-01-01 to 1988-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Badgers Unlimited Inc → SCA Manshaft Water Well; 1988-08-09 to 1988-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Daye Walter → SCA Manshaft Water Well; 1988-08-09 to 1988-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Daye Walter → Badgers Unlimited Inc; 1988-08-09 to 1988-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Sunnyside Coal Company → SCA Manshaft Water Well; 1988-12-02 to 2002-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Sunnyside Mines Inc → SCA Manshaft Water Well; 1988-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sunnyside Mines Inc → Sunnyside Coal Company; 1988-12-02 to 2002-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Exelon Corporation et al → SCA Manshaft Water Well; 2000-01-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sunnyside Cogeneration Assoc. → SCA Manshaft Water Well; 2002-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Exelon Corporation et al → Sunnyside Cogeneration Assoc.; 2002-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** ACI (American Consumer Industries Inc) et al → Sunnyside Cogeneration Assoc.; 2002-08-05 to current/open; source msha-controller-operator-history