# Relationship history for MSHA mine 2000682

Current hierarchy: **Richard A  Davidson → Interstate Aggregates Inc → Interstate Aggregates Inc**

- 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:** Michigan Aggregates Corporation → Interstate Aggregates Inc; 1950-01-01 to 2010-05-17; source msha-controller-operator-history
- **controller_controls_mine:** Richard A  Davidson → Interstate Aggregates Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard A  Davidson → Michigan Aggregates Corporation; 1950-01-01 to 2010-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Interstate Aggregates Inc → Interstate Aggregates Inc; 2010-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard A  Davidson → Interstate Aggregates Inc; 2010-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard A  Davidson → Interstate Aggregates Inc; 2010-05-18 to current/open; source msha-controller-operator-history