# Relationship history for MSHA mine 2300187

Current hierarchy: **Jones Willis D → Interstate Quarries → Interstate Quarry No 1**

- 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:** E D Rush Quarries Inc → Interstate Quarry No 1; 1950-01-01 to 1979-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Rush E D → Interstate Quarry No 1; 1950-01-01 to 1979-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Rush E D → E D Rush Quarries Inc; 1950-01-01 to 1979-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Interstate Quarries → Interstate Quarry No 1; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jones Willis D → Interstate Quarry No 1; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones Willis D → Interstate Quarries; 1979-07-01 to current/open; source msha-controller-operator-history