# Relationship history for MSHA mine 4400040

Current hierarchy: **Margaret J  Heckman → Eastern Ridge Lime Company L P → Eastern Ridge Lime Company L P**

- 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:** Virginia Lime Company → Eastern Ridge Lime Company L P; 1950-01-01 to 1989-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Rangaire Corp → Eastern Ridge Lime Company L P; 1950-01-01 to 1989-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Rangaire Corp → Virginia Lime Company; 1950-01-01 to 1989-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Virginia Lime Company → Eastern Ridge Lime Company L P; 1989-08-20 to 1992-07-14; source msha-controller-operator-history
- **controller_controls_mine:** United States Lime & Minerals Inc → Eastern Ridge Lime Company L P; 1989-08-20 to 1992-07-14; source msha-controller-operator-history
- **controller_controls_operator:** United States Lime & Minerals Inc → Virginia Lime Company; 1989-08-20 to 1992-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Ridge Lime Company L P → Eastern Ridge Lime Company L P; 1992-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Margaret J  Heckman  et al → Eastern Ridge Lime Company L P; 1992-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Margaret J  Heckman  et al → Eastern Ridge Lime Company L P; 1992-07-15 to current/open; source msha-controller-operator-history