# Relationship history for MSHA mine 4700587

Current hierarchy: **Graymont Ltd → Graymont (WI) LLC → Graymont Superior Lime 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

- **operator_operates_mine:** Graymont (WI) LLC → Graymont Superior Lime Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cutler Magner Company → Graymont Superior Lime Plant; 1950-01-01 to 2007-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Cutler Magner Company → Graymont (WI) LLC; 1950-01-01 to 2007-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Graymont Ltd → Graymont Superior Lime Plant; 2007-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graymont Ltd → Graymont (WI) LLC; 2007-11-30 to current/open; source msha-controller-operator-history