# Relationship history for MSHA mine 3002491

Current hierarchy: **Donald W  Clark → Clark Aggregates → CLARK AGGREGATES**

- 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

- **controller_controls_mine:** Gene Dewitt Corporation → CLARK AGGREGATES; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B R Dewitt Inc → CLARK AGGREGATES; 1980-03-01 to 1983-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Gene Dewitt Corporation → B R Dewitt Inc; 1980-03-01 to 1983-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Clark Aggregates → CLARK AGGREGATES; 1983-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald W  Clark → CLARK AGGREGATES; 1983-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald W  Clark → Clark Aggregates; 1983-04-05 to current/open; source msha-controller-operator-history