# Relationship history for MSHA mine 0503997

Current hierarchy: **Eagle Materials Inc → American Gypsum Company LLC → Eagle Gypsum Mine**

- 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:** Eagle-Gypsum Products → Eagle Gypsum Mine; 1984-12-01 to 1997-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Eagle Gypsum Ltd et al → Eagle Gypsum Mine; 1984-12-01 to 1997-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Eagle Gypsum Ltd et al → Eagle-Gypsum Products; 1984-12-01 to 1997-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Eagle Materials Inc → Eagle Gypsum Mine; 1985-02-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Gypsum Company LLC → Eagle Gypsum Mine; 1997-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eagle Materials Inc → American Gypsum Company LLC; 1997-03-01 to current/open; source msha-controller-operator-history