# Relationship history for MSHA mine 4801295

Current hierarchy: **Solvay S A → American Soda LLC → American Soda LLC**

- 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

- **operator_operates_mine:** Tenneco Minerals Company → American Soda LLC; 1979-08-01 to 1992-05-26; source msha-controller-operator-history
- **controller_controls_mine:** Tenneco Inc → American Soda LLC; 1979-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tenneco Inc → Tenneco Minerals Company; 1979-08-01 to 1992-05-26; source msha-controller-operator-history
- **operator_operates_mine:** Solvay Chemicals,  Inc → American Soda LLC; 1992-05-27 to 2021-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Solvay S A → American Soda LLC; 1992-05-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Solvay S A → Solvay Chemicals,  Inc; 1992-05-27 to 2021-10-31; source msha-controller-operator-history
- **operator_operates_mine:** American Soda LLC → American Soda LLC; 2021-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Solvay S A → American Soda LLC; 2021-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Solvay S A → American Soda LLC; 2021-11-01 to current/open; source msha-controller-operator-history