# Relationship history for MSHA mine 1102366

Current hierarchy: **Prairie Group → Prairie Materials Sales Inc → Plainfield Quarry**

- 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:** E & E Hauling Inc → Plainfield Quarry; 1950-01-01 to 1983-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Heil Edward F → Plainfield Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heil Edward F → E & E Hauling Inc; 1950-01-01 to 1983-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Prairie Materials Sales Inc → Plainfield Quarry; 1984-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Prairie Group → Plainfield Quarry; 1984-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Prairie Group → Prairie Materials Sales Inc; 1984-01-01 to current/open; source msha-controller-operator-history